PowerShell
diff --git a/Engine/Engine.csproj b/Engine/Engine.csproj
@@ -2,19 +2,19 @@
 
   <PropertyGroup>
     <VersionPrefix>1.21.0</VersionPrefix>
-    <TargetFrameworks>netcoreapp3.1;net452</TargetFrameworks>
+    <TargetFrameworks>netcoreapp3.1;net462</TargetFrameworks>
     <AssemblyName>Microsoft.Windows.PowerShell.ScriptAnalyzer</AssemblyName>
     <AssemblyVersion>1.21.0</AssemblyVersion>
     <PackageId>Engine</PackageId>
     <RootNamespace>Microsoft.Windows.PowerShell.ScriptAnalyzer</RootNamespace> <!-- Namespace needs to match Assembly name for ressource binding -->
     <LangVersion>9.0</LangVersion>
   </PropertyGroup>
 
-  <ItemGroup Condition=" '$(TargetFramework)' == 'net452' ">
+  <ItemGroup Condition=" '$(TargetFramework)' == 'net462' ">
     <Reference Include="System.ComponentModel.Composition" />
   </ItemGroup>
 
-  <PropertyGroup Condition=" '$(TargetFramework)' == 'net452' ">
+  <PropertyGroup Condition=" '$(TargetFramework)' == 'net462' ">
     <DebugType>portable</DebugType>
   </PropertyGroup>
 
@@ -70,15 +70,15 @@
     <DefineConstants>$(DefineConstants);PSV7;CORECLR</DefineConstants>
   </PropertyGroup>
 
-  <ItemGroup Condition="'$(TargetFramework)' == 'net452' AND '$(Configuration)' == 'PSV3Release' AND '$(Configuration)' != 'PSV4Release'">
+  <ItemGroup Condition="'$(TargetFramework)' == 'net462' AND '$(Configuration)' == 'PSV3Release' AND '$(Configuration)' != 'PSV4Release'">
     <PackageReference Include="Microsoft.PowerShell.3.ReferenceAssemblies" Version="1.0.0" />
   </ItemGroup>
 
-  <ItemGroup Condition="'$(TargetFramework)' == 'net452' AND '$(Configuration)' == 'PSV4Release'">
+  <ItemGroup Condition="'$(TargetFramework)' == 'net462' AND '$(Configuration)' == 'PSV4Release'">
     <PackageReference Include="Microsoft.PowerShell.4.ReferenceAssemblies" Version="1.0.0" />
   </ItemGroup>
 
-  <ItemGroup Condition="'$(TargetFramework)' == 'net452' AND '$(Configuration)' != 'PSV3Release'">
+  <ItemGroup Condition="'$(TargetFramework)' == 'net462' AND '$(Configuration)' != 'PSV3Release'">
     <PackageReference Include="Microsoft.PowerShell.5.ReferenceAssemblies" Version="1.1.0" />
   </ItemGroup>
 

diff --git a/Engine/FindAstPositionVisitor.cs b/Engine/FindAstPositionVisitor.cs
@@ -337,7 +337,7 @@ public override AstVisitAction VisitUsingStatement(UsingStatementAst usingStatem
          }
 #endif
 
-#if !(NET452 || PSV6) // NET452 includes V3,4,5
+#if !(NET462 || PSV7) // net462 includes V3,4,5
          public override AstVisitAction VisitPipelineChain(PipelineChainAst pipelineChainAst)
          {
              return Visit(pipelineChainAst);

diff --git a/...lector/Microsoft.PowerShell.CrossCompatibility/Collection/PlatformInformationCollector.cs b/...lector/Microsoft.PowerShell.CrossCompatibility/Collection/PlatformInformationCollector.cs
@@ -330,7 +330,7 @@ private Architecture GetProcessArchitecture()
             return (Architecture)RuntimeInformation.ProcessArchitecture;
 #else
             // We assume .NET Framework must be on an Intel architecture
-            // net452 does not reliably have the above API
+            // net462 does not reliably have the above API
             return Environment.Is64BitProcess
                 ? Architecture.X64
                 : Architecture.X86;
@@ -344,7 +344,7 @@ private Architecture GetOSArchitecture()
             return (Architecture)RuntimeInformation.OSArchitecture;
 #else
             // We assume .NET Framework must be on an Intel architecture
-            // net452 does not reliably have the above API
+            // net462 does not reliably have the above API
             return Environment.Is64BitOperatingSystem
                 ? Architecture.X64
                 : Architecture.X86;

diff --git a/...or/Microsoft.PowerShell.CrossCompatibility/Microsoft.PowerShell.CrossCompatibility.csproj b/...or/Microsoft.PowerShell.CrossCompatibility/Microsoft.PowerShell.CrossCompatibility.csproj
@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <VersionPrefix>1.21.0</VersionPrefix>
-    <TargetFrameworks>netstandard2.0;net452</TargetFrameworks>
+    <TargetFrameworks>netstandard2.0;net462</TargetFrameworks>
     <AssemblyVersion>1.21.0</AssemblyVersion>
   </PropertyGroup>
 
@@ -16,7 +16,7 @@
     <PackageReference Include="PowerShellStandard.Library" Version="3.0.0-preview-02" />
   </ItemGroup>
 
-  <ItemGroup Condition="'$(TargetFramework)' == 'net452'">
+  <ItemGroup Condition="'$(TargetFramework)' == 'net462'">
     <PackageReference Include="Microsoft.PowerShell.3.ReferenceAssemblies" Version="1.0.0" />
     <PackageReference Include="Microsoft.Management.Infrastructure" Version="1.0.0" />
   </ItemGroup>

diff --git a/PSCompatibilityCollector/PSCompatibilityCollector.psm1 b/PSCompatibilityCollector/PSCompatibilityCollector.psm1
@@ -8,5 +8,5 @@ if ($PSVersionTable.PSVersion.Major -ge 6)
 }
 else
 {
-    Import-Module ([System.IO.Path]::Combine($PSScriptRoot, 'net452', 'Microsoft.PowerShell.CrossCompatibility.dll')) -Force
+    Import-Module ([System.IO.Path]::Combine($PSScriptRoot, 'net462', 'Microsoft.PowerShell.CrossCompatibility.dll')) -Force
 }
diff --git a/PSCompatibilityCollector/build.ps1 b/PSCompatibilityCollector/build.ps1
@@ -8,7 +8,7 @@ param(
     $Configuration = 'Debug',
 
     [Parameter()]
-    [ValidateSet('netstandard2.0', 'net452')]
+    [ValidateSet('netstandard2.0', 'net462')]
     [string]
     $Framework,
 
@@ -24,7 +24,7 @@ $ErrorActionPreference = 'Stop'
 if ($IsWindows -eq $false) {
     $script:TargetFrameworks = 'netstandard2.0'
 } else {
-    $script:TargetFrameworks = 'netstandard2.0','net452'
+    $script:TargetFrameworks = 'netstandard2.0','net462'
 }
 
 $script:ModuleName = Split-Path $PSScriptRoot -Leaf
@@ -36,15 +36,15 @@ $script:BinModDir = [System.IO.Path]::Combine($PSScriptRoot, 'out', "$script:Mod
 $script:BinModSrcDir = Join-Path $PSScriptRoot 'Microsoft.PowerShell.CrossCompatibility'
 
 $script:PublishDlls = @{
-    'net452' = @('Microsoft.PowerShell.CrossCompatibility.dll', 'Microsoft.PowerShell.CrossCompatibility.pdb', 'Newtonsoft.Json.dll')
+    'net462' = @('Microsoft.PowerShell.CrossCompatibility.dll', 'Microsoft.PowerShell.CrossCompatibility.pdb', 'Newtonsoft.Json.dll')
     'netstandard2.0' = @('Microsoft.PowerShell.CrossCompatibility.dll', 'Microsoft.PowerShell.CrossCompatibility.pdb', 'Newtonsoft.Json.dll')
 }
 
 function Invoke-CrossCompatibilityModuleBuild
 {
     param(
         [Parameter()]
-        [ValidateSet('netstandard2.0', 'net452')]
+        [ValidateSet('netstandard2.0', 'net462')]
         [string]
         $Framework = 'netstandard2.0',
 

diff --git a/README.md b/README.md
@@ -71,9 +71,11 @@ To install **PSScriptAnalyzer** from source code:
 
 - [.NET Core 3.1.102 SDK](https://www.microsoft.com/net/download/dotnet-core/3.1#sdk-3.1.102) or
   newer patch release
+* If building for Windows PowerShell versions, then the .NET Framework 4.6.2 [targeting pack](https://dotnet.microsoft.com/en-us/download/dotnet-framework/net462) (also referred to as developer/targeting pack) need to be installed. This is only possible on Windows.
+* Optionally but recommended for development: [Visual Studio 2017/2019](https://www.visualstudio.com/downloads)
 - [Pester v5 PowerShell module, available on PowerShell Gallery](https://github.com/pester/Pester)
 - [PlatyPS PowerShell module, available on PowerShell Gallery](https://github.com/PowerShell/platyPS/releases)
-- Optionally but recommended for development: [Visual Studio 2017/2019](https://www.visualstudio.com/downloads/)
+- Optionally but recommended for development: [Visual Studio](https://www.visualstudio.com/downloads)
 
 ### Steps
 

diff --git a/Rules/Rules.csproj b/Rules/Rules.csproj
@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <VersionPrefix>1.21.0</VersionPrefix>
-    <TargetFrameworks>netcoreapp3.1;net452</TargetFrameworks>
+    <TargetFrameworks>netcoreapp3.1;net462</TargetFrameworks>
     <AssemblyName>Microsoft.Windows.PowerShell.ScriptAnalyzer.BuiltinRules</AssemblyName>
     <AssemblyVersion>1.21.0</AssemblyVersion>
     <PackageId>Rules</PackageId>
@@ -22,12 +22,12 @@
     <PackageReference Include="Pluralize.NET" Version="1.0.2" />
   </ItemGroup>
 
-  <ItemGroup Condition=" '$(TargetFramework)' == 'net452' ">
+  <ItemGroup Condition=" '$(TargetFramework)' == 'net462' ">
     <Reference Include="System.ComponentModel.Composition" />
     <Reference Include="System.Data.Entity.Design" />
   </ItemGroup>
 
-  <PropertyGroup Condition=" '$(TargetFramework)' == 'net452' ">
+  <PropertyGroup Condition=" '$(TargetFramework)' == 'net462' ">
     <DebugType>portable</DebugType>
   </PropertyGroup>
 

diff --git a/Rules/UseCmdletCorrectly.cs b/Rules/UseCmdletCorrectly.cs
@@ -29,11 +29,11 @@ public class UseCmdletCorrectly : IScriptRule
         private static readonly ConcurrentDictionary<string, IReadOnlyList<string>> s_pkgMgmtMandatoryParameters =
             new ConcurrentDictionary<string, IReadOnlyList<string>>(new Dictionary<string, IReadOnlyList<string>>
             {
-                { "Find-Package", new string[0] },
-                { "Find-PackageProvider", new string[0] },
-                { "Get-Package", new string[0] },
-                { "Get-PackageProvider", new string[0] },
-                { "Get-PackageSource", new string[0] },
+                { "Find-Package", Array.Empty<string>() },
+                { "Find-PackageProvider", Array.Empty<string>() },
+                { "Get-Package", Array.Empty<string>() },
+                { "Get-PackageProvider", Array.Empty<string>() },
+                { "Get-PackageSource", Array.Empty<string>() },
                 { "Import-PackageProvider", new string[] { "Name" } },
                 { "Install-Package", new string[] { "Name" } },
                 { "Install-PackageProvider", new string[] { "Name" } },

diff --git a/Rules/UseUsingScopeModifierInNewRunspaces.cs b/Rules/UseUsingScopeModifierInNewRunspaces.cs
@@ -183,7 +183,7 @@ public override AstVisitAction VisitScriptBlockExpression(ScriptBlockExpressionA
                         return AstVisitAction.Continue;
                     }
 
-                    HashSet<string> varsInLocalAssignments = FindVarsInAssignmentAsts(scriptBlockExpressionAst);
+                    IReadOnlyCollection<string> varsInLocalAssignments = FindVarsInAssignmentAsts(scriptBlockExpressionAst);
                     if (varsInLocalAssignments != null)
                     {
                         AddAssignedVarsToSession(sessionName, varsInLocalAssignments);
@@ -205,7 +205,7 @@ public override AstVisitAction VisitScriptBlockExpression(ScriptBlockExpressionA
             /// Example: `$foo = "foo"` ==> the VariableExpressionAst for $foo is returned
             /// </summary>
             /// <param name="ast"></param>
-            private static HashSet<string> FindVarsInAssignmentAsts(Ast ast)
+            private static IReadOnlyCollection<string> FindVarsInAssignmentAsts(Ast ast)
             {
                 HashSet<string> variableDictionary =
                     new HashSet<string>();
@@ -264,7 +264,7 @@ private static bool IsAssignmentStatementAst(Ast ast)
             /// <param name="ast"></param>
             /// <param name="varsInAssignments"></param>
             private static IEnumerable<VariableExpressionAst> FindNonAssignedNonUsingVarAsts(
-                Ast ast, HashSet<string> varsInAssignments)
+                Ast ast, IReadOnlyCollection<string> varsInAssignments)
             {
                 // Find all variables that are not locally assigned, and don't have $using: scope modifier
                 foreach (VariableExpressionAst variable in ast.FindAll(IsNonUsingNonSpecialVariableExpressionAst, true))
@@ -368,7 +368,7 @@ private static bool TryGetSessionNameFromInvokeCommand(CommandAst invokeCommandA
             /// GetAssignedVarsInSession: Retrieves all previously declared vars for a given session (as in Invoke-Command -Session $session).
             /// </summary>
             /// <param name="sessionName"></param>
-            private HashSet<string> GetAssignedVarsInSession(string sessionName)
+            private IReadOnlyCollection<string> GetAssignedVarsInSession(string sessionName)
             {
                 return _varsDeclaredPerSession[sessionName];
             }
@@ -378,7 +378,7 @@ private HashSet<string> GetAssignedVarsInSession(string sessionName)
             /// </summary>
             /// <param name="sessionName"></param>
             /// <param name="variablesToAdd"></param>
-            private void AddAssignedVarsToSession(string sessionName, HashSet<string> variablesToAdd)
+            private void AddAssignedVarsToSession(string sessionName, IReadOnlyCollection<string> variablesToAdd)
             {
                 if (!_varsDeclaredPerSession.ContainsKey(sessionName))
                 {

diff --git a/appveyor.yml b/appveyor.yml
@@ -30,7 +30,7 @@ build_script:
              ./build.ps1 -Configuration "$env:BuildConfiguration" -PSVersion 3
           }
           ./build.ps1 -Configuration "$env:BuildConfiguration" -PSVersion "$env:PSVersion"
-          ./PSCompatibilityCollector/build.ps1 -Configuration "$env:BuildConfiguration" -Framework 'net452'
+          ./PSCompatibilityCollector/build.ps1 -Configuration "$env:BuildConfiguration" -Framework 'net462'
       }
   - pwsh: |
       if ($env:PowerShellEdition -eq 'PowerShellCore') {

diff --git a/build.psm1 b/build.psm1
@@ -201,13 +201,13 @@ function Start-ScriptAnalyzerBuild
             Set-Variable -Name profilesCopied -Value $true -Scope 1
         }
 
-        $framework = 'net452'
+        $framework = 'net462'
         if ($PSVersion -eq 7) {
             $framework = 'netcoreapp3.1'
         }
 
         # build the appropriate assembly
-        if ($PSVersion -match "[34]" -and $Framework -ne "net452")
+        if ($PSVersion -match "[34]" -and $Framework -ne "net462")
         {
             throw ("ScriptAnalyzer for PS version '{0}' is not applicable to {1} framework" -f $PSVersion,$Framework)
         }
@@ -322,7 +322,7 @@ function Start-ScriptAnalyzerBuild
         else {
             "$projectRoot\Rules\bin\${buildConfiguration}\${framework}"
         }
-        if ($framework -eq 'net452') {
+        if ($framework -eq 'net462') {
             $nsoft = Join-Path $rulesProjectOutputDir 'Newtonsoft.Json.dll'
             Copy-Item -path $nsoft -Destination $destinationDirBinaries
         }

diff --git a/tools/releaseBuild/signing.xml b/tools/releaseBuild/signing.xml
@@ -44,8 +44,8 @@
     <file src="__INPATHROOT__\out\PSCompatibilityCollector\netstandard2.0\Microsoft.PowerShell.CrossCompatibility.dll" signType="Authenticode" dest="__OUTPATHROOT__\PSCompatibilityCollector\netstandard2.0\Microsoft.PowerShell.CrossCompatibility.dll" />
     <file src="__INPATHROOT__\out\PSCompatibilityCollector\netstandard2.0\Newtonsoft.Json.dll" signType="Authenticode" dest="__OUTPATHROOT__\PSCompatibilityCollector\netstandard2.0\Newtonsoft.Json.dll" />
  </job>
- <job platform="" configuration="" dest="__OUTPATHROOT__\signed" jobname="PowerShell Compatibility Analyzer net452 DLLs" approvers="vigarg;gstolt">
-    <file src="__INPATHROOT__\out\PSCompatibilityCollector\net452\Microsoft.PowerShell.CrossCompatibility.dll" signType="Authenticode" dest="__OUTPATHROOT__\PSCompatibilityCollector\net452\Microsoft.PowerShell.CrossCompatibility.dll" />
-    <file src="__INPATHROOT__\out\PSCompatibilityCollector\net452\Newtonsoft.Json.dll" signType="Authenticode" dest="__OUTPATHROOT__\PSCompatibilityCollector\net452\Newtonsoft.Json.dll" />
+ <job platform="" configuration="" dest="__OUTPATHROOT__\signed" jobname="PowerShell Compatibility Analyzer net462 DLLs" approvers="vigarg;gstolt">
+    <file src="__INPATHROOT__\out\PSCompatibilityCollector\net462\Microsoft.PowerShell.CrossCompatibility.dll" signType="Authenticode" dest="__OUTPATHROOT__\PSCompatibilityCollector\net462\Microsoft.PowerShell.CrossCompatibility.dll" />
+    <file src="__INPATHROOT__\out\PSCompatibilityCollector\net462\Newtonsoft.Json.dll" signType="Authenticode" dest="__OUTPATHROOT__\PSCompatibilityCollector\net462\Newtonsoft.Json.dll" />
  </job>
 </SignConfigXML>
-Original file line number
+Diff line change
@@ Expand Up / @@ -8,5 +8,5 @@ if ($PSVersionTable.PSVersion.Major -ge 6) @@
     }
     else
     {
-        Import-Module ([System.IO.Path]::Combine($PSScriptRoot, 'net452', 'Microsoft.PowerShell.CrossCompatibility.dll')) -Force
+        Import-Module ([System.IO.Path]::Combine($PSScriptRoot, 'net462', 'Microsoft.PowerShell.CrossCompatibility.dll')) -Force
     }