Perform disc install operations first

This allows there to be an incrementing progress bar while the CAB is
copied instead of the bar sitting at the end and never moving, thereby
granting the user a sense of progress in the installation.

SR-Alternate-Installer.iss

@@ -72,7 +72,9 @@ Name: "desktopicon"; Description: "{cm:CreateDesktopIcon}"; GroupDescription: "{
 Name: "adminrun"; Description: "Run {#MyAppName} with Administrator Rights"; GroupDescription: "{cm:AdditionalIcons}"
 
 [Files]
-; Tools needed for a successful installation
+Source: "{code:GetSourceDrive}\resource.cfg"; DestDir: "{app}"; Flags: external ignoreversion
+Source: "{code:GetSourceDrive}\data1.cab"; DestDir: "{app}"; Flags: external ignoreversion deleteafterinstall
+
 Source: "Tools\CABExtract\i5comp.exe"; DestDir: "{app}"; Flags: deleteafterinstall
 Source: "Tools\CABExtract\ZD51145.DLL"; DestDir: "{app}"; Flags: deleteafterinstall
 Source: "Tools\post-install.bat"; DestDir: "{app}"; Flags: deleteafterinstall
@@ -81,9 +83,6 @@ Source: "STUNT_RALLY_MANUAL_UK.pdf"; DestDir: "{app}"; Flags: ignoreversion
 Source: "StuntRally.ico"; DestDir: "{app}"; Flags: ignoreversion
 Source: "Tools\d3drm.dll"; DestDir: "{app}"; Flags: ignoreversion
 
-Source: "{code:GetSourceDrive}\resource.cfg"; DestDir: "{app}"; Flags: external ignoreversion
-Source: "{code:GetSourceDrive}\data1.cab"; DestDir: "{app}"; Flags: external ignoreversion deleteafterinstall
-
 [Icons]
 ; First and last icons are created only if user choose not to use the videos,
 ; else the normal ones are created.