diff --git a/src/Microsoft.DotNet.Build.Tasks.Workloads.Tests/CreateVisualStudioWorkloadSetTests.cs b/src/Microsoft.DotNet.Build.Tasks.Workloads.Tests/CreateVisualStudioWorkloadSetTests.cs
index 883d16d31d3..4815c41fe2c 100644
--- a/src/Microsoft.DotNet.Build.Tasks.Workloads.Tests/CreateVisualStudioWorkloadSetTests.cs
+++ b/src/Microsoft.DotNet.Build.Tasks.Workloads.Tests/CreateVisualStudioWorkloadSetTests.cs
@@ -57,6 +57,9 @@ public static void ItCanCreateWorkloadSets()
                 r.Name == "ProductVersion" &&
                 r.Value == "12.8.45");
 
+            // Workload sets are SxS. Verify that we don't have an Upgrade table.
+            Assert.False(MsiUtils.HasTable(msi.ItemSpec, "Upgrade"));
+
             // Verify the SWIX authoring for one of the workload set MSIs. 
             ITaskItem workloadSetSwixItem = createWorkloadSetTask.SwixProjects.Where(s => s.ItemSpec.Contains(@"Microsoft.NET.Workloads.9.0.100.9.0.100-baseline.1.23464.1\x64")).FirstOrDefault();
             Assert.Equal(DefaultValues.PackageTypeMsiWorkloadSet, workloadSetSwixItem.GetMetadata(Metadata.PackageType));
diff --git a/src/Microsoft.DotNet.Build.Tasks.Workloads.Tests/SwixPackageTests.cs b/src/Microsoft.DotNet.Build.Tasks.Workloads.Tests/SwixPackageTests.cs
index 418915721ea..99b98e1b112 100644
--- a/src/Microsoft.DotNet.Build.Tasks.Workloads.Tests/SwixPackageTests.cs
+++ b/src/Microsoft.DotNet.Build.Tasks.Workloads.Tests/SwixPackageTests.cs
@@ -35,12 +35,12 @@ public void ItThrowsIfPackageRelativePathExceedsLimit()
             Assert.Equal(@"Relative package path exceeds the maximum length (182): Microsoft.NET.Workload.Mono.ToolChain.Manifest-6.0.100,version=6.0.0.0,chip=x64,productarch=neutral,machinearch=x64\Microsoft.NET.Workload.Mono.ToolChain.Manifest-6.0.100.6.0.0-preview.7.21377.12-x64.msi.", e.Message);
         }
 
-        [WindowsOnlyTheory]
-        [InlineData("16.0.527")]
-        public void ItOnlyIncludesDefinedPropertiesForMsiPackages(string packageVersion)
+        [WindowsOnlyFact]
+        public void ItOnlyIncludesDefinedPropertiesForMsiPackages()
         {
             // Build to a different path to avoid any file read locks on the MSI from other tests
             // that can open it.
+            string packageVersion = "16.0.527";
             string PackageRootDirectory = Path.Combine(BaseIntermediateOutputPath, Path.GetRandomFileName());
             string packagePath = Path.Combine(TestAssetsPath, $"microsoft.ios.templates.{packageVersion}.nupkg");
 
diff --git a/src/Microsoft.DotNet.Build.Tasks.Workloads/src/CreateVisualStudioWorkloadSet.wix.cs b/src/Microsoft.DotNet.Build.Tasks.Workloads/src/CreateVisualStudioWorkloadSet.wix.cs
index 93acbc1db7f..97ea915591e 100644
--- a/src/Microsoft.DotNet.Build.Tasks.Workloads/src/CreateVisualStudioWorkloadSet.wix.cs
+++ b/src/Microsoft.DotNet.Build.Tasks.Workloads/src/CreateVisualStudioWorkloadSet.wix.cs
@@ -95,14 +95,11 @@ protected override bool ExecuteCore()
                     }
                 });
 
-                _ = Parallel.ForEach(swixPackageGroups, swixPackageGroup =>
+                foreach (var swixPackageGroup in swixPackageGroups)
                 {
-                    lock (swixProjectItems)
-                    {
-                        swixProjectItems.Add(PackageGroupSwixProject.CreateProjectItem(swixPackageGroup, BaseIntermediateOutputPath, BaseOutputPath,
-                            DefaultValues.PackageTypeWorkloadSetPackageGroup));
-                    }
-                });
+                    swixProjectItems.Add(PackageGroupSwixProject.CreateProjectItem(swixPackageGroup, BaseIntermediateOutputPath, BaseOutputPath,
+                        DefaultValues.PackageTypeWorkloadSetPackageGroup));
+                }
             }
 
             Msis = msiItems.ToArray();
diff --git a/src/Microsoft.DotNet.Build.Tasks.Workloads/src/Msi/MsiUtils.wix.cs b/src/Microsoft.DotNet.Build.Tasks.Workloads/src/Msi/MsiUtils.wix.cs
index 47bcfe2841f..4e7d29f738b 100644
--- a/src/Microsoft.DotNet.Build.Tasks.Workloads/src/Msi/MsiUtils.wix.cs
+++ b/src/Microsoft.DotNet.Build.Tasks.Workloads/src/Msi/MsiUtils.wix.cs
@@ -206,5 +206,19 @@ public static void ValidateProductVersion(Version version)
                 throw new ArgumentOutOfRangeException(string.Format(Strings.MsiProductVersionOutOfRange, nameof(version.Build), ushort.MaxValue));
             }
         }
+
+        /// <summary>
+        /// Determines if the MSI contains a specific table.
+        /// </summary>
+        /// <param name="packagePath">The path to the MSI package.</param>
+        /// <param name="tableName">The name of the table.</param>
+        /// <returns><see langword="true"/> if the table exists; <see langword="false"/> otherwise.</returns>
+        public static bool HasTable(string packagePath, string tableName)
+        {
+            using InstallPackage ip = new(packagePath, DatabaseOpenMode.ReadOnly);
+            using Database db = new(packagePath, DatabaseOpenMode.ReadOnly);
+
+            return db.Tables.Contains(tableName);
+        }
     }
 }
diff --git a/src/Microsoft.DotNet.Build.Tasks.Workloads/src/MsiTemplate/WorkloadSetProduct.wxs b/src/Microsoft.DotNet.Build.Tasks.Workloads/src/MsiTemplate/WorkloadSetProduct.wxs
index ee77df5f773..01429f57ff6 100644
--- a/src/Microsoft.DotNet.Build.Tasks.Workloads/src/MsiTemplate/WorkloadSetProduct.wxs
+++ b/src/Microsoft.DotNet.Build.Tasks.Workloads/src/MsiTemplate/WorkloadSetProduct.wxs
@@ -7,22 +7,6 @@
 
     <Package InstallerVersion="$(var.InstallerVersion)" Compressed="yes" InstallScope="perMachine" />
 
-    <!-- MajorUpgrade element doesn't support setting the language attribute in the upgrade table -->
-    <Upgrade Id="$(var.UpgradeCode)">
-      <UpgradeVersion Maximum="$(var.ProductVersion)" MigrateFeatures="yes" IncludeMinimum="no" Property="WIX_UPGRADE_DETECTED" />
-      <UpgradeVersion Minimum="$(var.ProductVersion)" IncludeMinimum="no" OnlyDetect="yes" Property="WIX_DOWNGRADE_DETECTED" />
-    </Upgrade>
-
-    <!-- The new MSI is installed before the older version is removed. This is the fastest upgrade option. -->
-    <InstallExecuteSequence>
-      <!-- See https://docs.microsoft.com/en-us/windows/win32/msi/removeexistingproducts-action for other options -->
-      <RemoveExistingProducts After="InstallFinalize" />
-    </InstallExecuteSequence>
-
-    <Condition Message="A newer version of [ProductName] is alread installed.">
-      NOT WIX_DOWNGRADE_DETECTED
-    </Condition>
-
     <?if $(var.Platform)~=x64?>
     <CustomActionRef Id="Set_DOTNETHOME_NON_NATIVE_ARCHITECTURE" />
     <?endif?>