diff --git a/.vs/bled.vcxproj b/.vs/bled.vcxproj
index cd644667ed8..a2132ebb5b1 100644
--- a/.vs/bled.vcxproj
+++ b/.vs/bled.vcxproj
@@ -234,6 +234,7 @@
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
     <ClCompile>
       <WarningLevel>Level3</WarningLevel>
+      <Optimization>MaxSpeed</Optimization>
       <PreprocessorDefinitions>_OFF_T_DEFINED;_off_t=__int64;off_t=_off_t;_FILE_OFFSET_BITS=64;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <RuntimeLibrary>MultiThreaded</RuntimeLibrary>
       <AdditionalIncludeDirectories>..\src</AdditionalIncludeDirectories>
@@ -254,6 +255,7 @@
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|ARM'">
     <ClCompile>
       <WarningLevel>Level3</WarningLevel>
+      <Optimization>MaxSpeed</Optimization>
       <IntrinsicFunctions>true</IntrinsicFunctions>
       <PreprocessorDefinitions>_OFF_T_DEFINED;_off_t=__int64;off_t=_off_t;_FILE_OFFSET_BITS=64;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <RuntimeLibrary>MultiThreaded</RuntimeLibrary>
@@ -274,6 +276,7 @@
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|ARM64'">
     <ClCompile>
       <WarningLevel>Level3</WarningLevel>
+      <Optimization>MaxSpeed</Optimization>
       <IntrinsicFunctions>true</IntrinsicFunctions>
       <PreprocessorDefinitions>_OFF_T_DEFINED;_off_t=__int64;off_t=_off_t;_FILE_OFFSET_BITS=64;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <RuntimeLibrary>MultiThreaded</RuntimeLibrary>
@@ -294,6 +297,7 @@
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
     <ClCompile>
       <WarningLevel>Level3</WarningLevel>
+      <Optimization>MaxSpeed</Optimization>
       <PreprocessorDefinitions>_OFF_T_DEFINED;_off_t=__int64;off_t=_off_t;_FILE_OFFSET_BITS=64;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <RuntimeLibrary>MultiThreaded</RuntimeLibrary>
       <AdditionalIncludeDirectories>..\src</AdditionalIncludeDirectories>
diff --git a/.vs/ext2fs.vcxproj b/.vs/ext2fs.vcxproj
index 5a920259b09..47d649ac3f6 100644
--- a/.vs/ext2fs.vcxproj
+++ b/.vs/ext2fs.vcxproj
@@ -273,6 +273,7 @@
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
     <ClCompile>
       <WarningLevel>Level3</WarningLevel>
+      <Optimization>MaxSpeed</Optimization>
       <PreprocessorDefinitions>_CRT_SECURE_NO_WARNINGS;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <RuntimeLibrary>MultiThreaded</RuntimeLibrary>
       <AdditionalIncludeDirectories>..\src;..\src\msvc-missing</AdditionalIncludeDirectories>
@@ -294,6 +295,7 @@
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|ARM'">
     <ClCompile>
       <WarningLevel>Level3</WarningLevel>
+      <Optimization>MaxSpeed</Optimization>
       <IntrinsicFunctions>true</IntrinsicFunctions>
       <PreprocessorDefinitions>_CRT_SECURE_NO_WARNINGS;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <RuntimeLibrary>MultiThreaded</RuntimeLibrary>
@@ -314,6 +316,7 @@
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|ARM64'">
     <ClCompile>
       <WarningLevel>Level3</WarningLevel>
+      <Optimization>MaxSpeed</Optimization>
       <IntrinsicFunctions>true</IntrinsicFunctions>
       <PreprocessorDefinitions>_CRT_SECURE_NO_WARNINGS;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <RuntimeLibrary>MultiThreaded</RuntimeLibrary>
@@ -334,6 +337,7 @@
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
     <ClCompile>
       <WarningLevel>Level3</WarningLevel>
+      <Optimization>MaxSpeed</Optimization>
       <PreprocessorDefinitions>_CRT_SECURE_NO_WARNINGS;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <RuntimeLibrary>MultiThreaded</RuntimeLibrary>
       <AdditionalIncludeDirectories>..\src;..\src\msvc-missing</AdditionalIncludeDirectories>
diff --git a/.vs/getopt.vcxproj b/.vs/getopt.vcxproj
index afdeb56a4a7..338209996e9 100644
--- a/.vs/getopt.vcxproj
+++ b/.vs/getopt.vcxproj
@@ -142,6 +142,7 @@
       <WarningLevel>Level3</WarningLevel>
       <DebugInformationFormat>ProgramDatabase</DebugInformationFormat>
       <DisableSpecificWarnings>28252;28253</DisableSpecificWarnings>
+      <Optimization>Disabled</Optimization>
       <AdditionalOptions>/utf-8 %(AdditionalOptions)</AdditionalOptions>
     </ClCompile>
     <Lib>
@@ -155,6 +156,7 @@
       <WarningLevel>Level3</WarningLevel>
       <DebugInformationFormat>ProgramDatabase</DebugInformationFormat>
       <DisableSpecificWarnings>28252;28253</DisableSpecificWarnings>
+      <Optimization>Disabled</Optimization>
       <AdditionalOptions>/utf-8 %(AdditionalOptions)</AdditionalOptions>
     </ClCompile>
     <Lib>
@@ -227,6 +229,7 @@
       <TargetEnvironment>X64</TargetEnvironment>
     </Midl>
     <ClCompile>
+      <Optimization>MaxSpeed</Optimization>
       <PreprocessorDefinitions>HAVE_STRING_H;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <RuntimeLibrary>MultiThreaded</RuntimeLibrary>
       <WarningLevel>Level3</WarningLevel>
diff --git a/.vs/libcdio-driver.vcxproj b/.vs/libcdio-driver.vcxproj
index abf5cf5f29d..97afd1ce3e8 100644
--- a/.vs/libcdio-driver.vcxproj
+++ b/.vs/libcdio-driver.vcxproj
@@ -210,6 +210,7 @@
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
     <ClCompile>
       <WarningLevel>Level3</WarningLevel>
+      <Optimization>MaxSpeed</Optimization>
       <PreprocessorDefinitions>HAVE_CONFIG_H;_OFF_T_DEFINED;_off_t=__int64;off_t=_off_t;_FILE_OFFSET_BITS=64;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <AdditionalIncludeDirectories>..\src;..\src\libcdio;..\src\msvc-missing;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
       <RuntimeLibrary>MultiThreaded</RuntimeLibrary>
@@ -276,6 +277,7 @@
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
     <ClCompile>
       <WarningLevel>Level3</WarningLevel>
+      <Optimization>MaxSpeed</Optimization>
       <PreprocessorDefinitions>HAVE_CONFIG_H;_OFF_T_DEFINED;_off_t=__int64;off_t=_off_t;_FILE_OFFSET_BITS=64;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <AdditionalIncludeDirectories>..\src;..\src\libcdio;..\src\msvc-missing;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
       <RuntimeLibrary>MultiThreaded</RuntimeLibrary>
diff --git a/.vs/libcdio-iso9660.vcxproj b/.vs/libcdio-iso9660.vcxproj
index e3b680aa62e..c5f184960b1 100644
--- a/.vs/libcdio-iso9660.vcxproj
+++ b/.vs/libcdio-iso9660.vcxproj
@@ -203,6 +203,7 @@
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
     <ClCompile>
       <WarningLevel>Level3</WarningLevel>
+      <Optimization>MaxSpeed</Optimization>
       <PreprocessorDefinitions>HAVE_CONFIG_H;_OFF_T_DEFINED;_off_t=__int64;off_t=_off_t;_FILE_OFFSET_BITS=64;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <AdditionalIncludeDirectories>..\src;..\src\libcdio;..\src\libcdio\driver;..\src\msvc-missing;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
       <RuntimeLibrary>MultiThreaded</RuntimeLibrary>
@@ -269,6 +270,7 @@
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
     <ClCompile>
       <WarningLevel>Level3</WarningLevel>
+      <Optimization>MaxSpeed</Optimization>
       <PreprocessorDefinitions>HAVE_CONFIG_H;_OFF_T_DEFINED;_off_t=__int64;off_t=_off_t;_FILE_OFFSET_BITS=64;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <AdditionalIncludeDirectories>..\src;..\src\libcdio;..\src\libcdio\driver;..\src\msvc-missing;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
       <RuntimeLibrary>MultiThreaded</RuntimeLibrary>
diff --git a/.vs/libcdio-udf.vcxproj b/.vs/libcdio-udf.vcxproj
index 0a08cb5d415..319dc29450a 100644
--- a/.vs/libcdio-udf.vcxproj
+++ b/.vs/libcdio-udf.vcxproj
@@ -196,6 +196,7 @@
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
     <ClCompile>
       <WarningLevel>Level3</WarningLevel>
+      <Optimization>MaxSpeed</Optimization>
       <PreprocessorDefinitions>HAVE_CONFIG_H;_OFF_T_DEFINED;_off_t=__int64;off_t=_off_t;_FILE_OFFSET_BITS=64;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <AdditionalIncludeDirectories>..\src;..\src\libcdio;..\src\libcdio\driver;..\src\msvc-missing;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
       <RuntimeLibrary>MultiThreaded</RuntimeLibrary>
@@ -262,6 +263,7 @@
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
     <ClCompile>
       <WarningLevel>Level3</WarningLevel>
+      <Optimization>MaxSpeed</Optimization>
       <PreprocessorDefinitions>HAVE_CONFIG_H;_OFF_T_DEFINED;_off_t=__int64;off_t=_off_t;_FILE_OFFSET_BITS=64;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <AdditionalIncludeDirectories>..\src;..\src\libcdio;..\src\libcdio\driver;..\src\msvc-missing;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
       <RuntimeLibrary>MultiThreaded</RuntimeLibrary>
diff --git a/.vs/ms-sys.vcxproj b/.vs/ms-sys.vcxproj
index 72b054a79d7..798ce5778dd 100644
--- a/.vs/ms-sys.vcxproj
+++ b/.vs/ms-sys.vcxproj
@@ -242,6 +242,7 @@
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
     <ClCompile>
       <WarningLevel>Level3</WarningLevel>
+      <Optimization>MaxSpeed</Optimization>
       <PreprocessorDefinitions>%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <AdditionalIncludeDirectories>..\src\ms-sys\inc;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
       <RuntimeLibrary>MultiThreaded</RuntimeLibrary>
@@ -312,6 +313,7 @@
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
     <ClCompile>
       <WarningLevel>Level3</WarningLevel>
+      <Optimization>MaxSpeed</Optimization>
       <PreprocessorDefinitions>%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <AdditionalIncludeDirectories>..\src\ms-sys\inc;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
       <RuntimeLibrary>MultiThreaded</RuntimeLibrary>
diff --git a/.vs/rufus.vcxproj b/.vs/rufus.vcxproj
index 270b2754206..a1d3dea585b 100644
--- a/.vs/rufus.vcxproj
+++ b/.vs/rufus.vcxproj
@@ -159,6 +159,7 @@
       <MultiProcessorCompilation>true</MultiProcessorCompilation>
       <ExceptionHandling>Async</ExceptionHandling>
       <DisableSpecificWarnings>4091;5255;28251;28252;28253;%(DisableSpecificWarnings)</DisableSpecificWarnings>
+      <Optimization>Disabled</Optimization>
       <AdditionalOptions>/utf-8 $(ExternalCompilerOptions) %(AdditionalOptions)</AdditionalOptions>
     </ClCompile>
     <Link>
@@ -190,6 +191,7 @@
       <MultiProcessorCompilation>true</MultiProcessorCompilation>
       <ExceptionHandling>Async</ExceptionHandling>
       <DisableSpecificWarnings>4091;5255;28251;28252;28253;%(DisableSpecificWarnings)</DisableSpecificWarnings>
+      <Optimization>Disabled</Optimization>
       <AdditionalOptions>/utf-8 $(ExternalCompilerOptions) %(AdditionalOptions)</AdditionalOptions>
     </ClCompile>
     <Link>
@@ -255,6 +257,7 @@
       <MultiProcessorCompilation>true</MultiProcessorCompilation>
       <ExceptionHandling>Async</ExceptionHandling>
       <DisableSpecificWarnings>4091;5255;28251;28252;28253;%(DisableSpecificWarnings)</DisableSpecificWarnings>
+      <Optimization>MaxSpeed</Optimization>
       <UndefinePreprocessorDefinitions>NDEBUG</UndefinePreprocessorDefinitions>
       <AdditionalOptions>/utf-8 $(ExternalCompilerOptions) %(AdditionalOptions)</AdditionalOptions>
       <StringPooling>true</StringPooling>
@@ -287,6 +290,7 @@
       <MultiProcessorCompilation>true</MultiProcessorCompilation>
       <ExceptionHandling>Async</ExceptionHandling>
       <DisableSpecificWarnings>4091;5255;28251;28252;28253;%(DisableSpecificWarnings)</DisableSpecificWarnings>
+      <Optimization>MaxSpeed</Optimization>
       <UndefinePreprocessorDefinitions>NDEBUG</UndefinePreprocessorDefinitions>
       <AdditionalOptions>/utf-8 $(ExternalCompilerOptions) %(AdditionalOptions)</AdditionalOptions>
       <StringPooling>true</StringPooling>
@@ -321,6 +325,7 @@
       <MultiProcessorCompilation>true</MultiProcessorCompilation>
       <ExceptionHandling>Async</ExceptionHandling>
       <DisableSpecificWarnings>4091;5255;28251;28252;28253;%(DisableSpecificWarnings)</DisableSpecificWarnings>
+      <Optimization>MaxSpeed</Optimization>
       <UndefinePreprocessorDefinitions>NDEBUG</UndefinePreprocessorDefinitions>
       <AdditionalOptions>/utf-8 $(ExternalCompilerOptions) %(AdditionalOptions)</AdditionalOptions>
       <StringPooling>true</StringPooling>
@@ -358,6 +363,7 @@
       <MultiProcessorCompilation>true</MultiProcessorCompilation>
       <ExceptionHandling>Async</ExceptionHandling>
       <DisableSpecificWarnings>4091;5255;28251;28252;28253;%(DisableSpecificWarnings)</DisableSpecificWarnings>
+      <Optimization>MaxSpeed</Optimization>
       <UndefinePreprocessorDefinitions>NDEBUG</UndefinePreprocessorDefinitions>
       <AdditionalOptions>/utf-8 $(ExternalCompilerOptions) %(AdditionalOptions)</AdditionalOptions>
       <StringPooling>true</StringPooling>
diff --git a/.vs/syslinux-libfat.vcxproj b/.vs/syslinux-libfat.vcxproj
index 9fffba11616..eea180fd901 100644
--- a/.vs/syslinux-libfat.vcxproj
+++ b/.vs/syslinux-libfat.vcxproj
@@ -196,6 +196,7 @@
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
     <ClCompile>
       <WarningLevel>Level3</WarningLevel>
+      <Optimization>MaxSpeed</Optimization>
       <PreprocessorDefinitions>inline=__inline;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <AdditionalIncludeDirectories>..\src;..\src\msvc-missing;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
       <RuntimeLibrary>MultiThreaded</RuntimeLibrary>
@@ -266,6 +267,7 @@
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
     <ClCompile>
       <WarningLevel>Level3</WarningLevel>
+      <Optimization>MaxSpeed</Optimization>
       <PreprocessorDefinitions>inline=__inline;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <AdditionalIncludeDirectories>..\src;..\src\msvc-missing;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
       <RuntimeLibrary>MultiThreaded</RuntimeLibrary>
diff --git a/.vs/syslinux-libinstaller.vcxproj b/.vs/syslinux-libinstaller.vcxproj
index 87dcb8d6c8d..166b09bfa4c 100644
--- a/.vs/syslinux-libinstaller.vcxproj
+++ b/.vs/syslinux-libinstaller.vcxproj
@@ -195,6 +195,7 @@
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
     <ClCompile>
       <WarningLevel>Level3</WarningLevel>
+      <Optimization>MaxSpeed</Optimization>
       <PreprocessorDefinitions>inline=__inline;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <AdditionalIncludeDirectories>..\src;..\src\msvc-missing;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
       <RuntimeLibrary>MultiThreaded</RuntimeLibrary>
@@ -265,6 +266,7 @@
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
     <ClCompile>
       <WarningLevel>Level3</WarningLevel>
+      <Optimization>MaxSpeed</Optimization>
       <PreprocessorDefinitions>inline=__inline;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <AdditionalIncludeDirectories>..\src;..\src\msvc-missing;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
       <RuntimeLibrary>MultiThreaded</RuntimeLibrary>
diff --git a/.vs/syslinux-win.vcxproj b/.vs/syslinux-win.vcxproj
index 0d3f48a578f..8d42c379ce8 100644
--- a/.vs/syslinux-win.vcxproj
+++ b/.vs/syslinux-win.vcxproj
@@ -189,6 +189,7 @@
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
     <ClCompile>
       <WarningLevel>Level3</WarningLevel>
+      <Optimization>MaxSpeed</Optimization>
       <PreprocessorDefinitions>inline=__inline;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <AdditionalIncludeDirectories>..\src;..\src\msvc-missing;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
       <RuntimeLibrary>MultiThreaded</RuntimeLibrary>
@@ -259,6 +260,7 @@
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
     <ClCompile>
       <WarningLevel>Level3</WarningLevel>
+      <Optimization>MaxSpeed</Optimization>
       <PreprocessorDefinitions>inline=__inline;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <AdditionalIncludeDirectories>..\src;..\src\msvc-missing;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
       <RuntimeLibrary>MultiThreaded</RuntimeLibrary>
diff --git a/src/stdlg.c b/src/stdlg.c
index fde699fcf07..bd65fa42401 100644
--- a/src/stdlg.c
+++ b/src/stdlg.c
@@ -1445,6 +1445,12 @@ void SetFidoCheck(void)
 		return;
 	}
 
+	if (nWindowsVersion < WINDOWS_8) {
+		ubprintf("Notice: The ISO download feature has been deactivated because "
+			"your version of Windows is too old.");
+		return;
+	}
+
 	CreateThread(NULL, 0, CheckForFidoThread, NULL, 0, NULL);
 }