Update how-to-determine-which-versions-are-installed.md

Make script to detect old .NET Framework versions compatible with PowerShell 2

Author: stamminator

docs/framework/migration-guide/how-to-determine-which-versions-are-installed.md

@@ -266,9 +266,9 @@ ForEach-Object {
         $parentName = $_.PSChildName
         Get-ChildItem -LiteralPath $_.PSPath |
         Where-Object {
-            if ($_.Property -contains 'Version') { $name = Get-ItemPropertyValue -Path $_.PSPath -Name Version }
-            if ($name -and ($_.Property -contains 'SP')) { $sp = Get-ItemPropertyValue -Path $_.PSPath -Name SP }
-            if ($_.Property -contains 'Install') { $install = Get-ItemPropertyValue -Path $_.PSPath -Name Install }
+            if ($_.Property -contains 'Version') { $name = $((Get-ItemProperty -Path "Registry::$_").Version) }
+            if ($name -and ($_.Property -contains 'SP')) { $sp = $((Get-ItemProperty -Path "Registry::$_").SP) }
+            if ($_.Property -contains 'Install') { $install = $((Get-ItemProperty -Path "Registry::$_").Install) }
             if (-not $install) {
                 Write-Host -Object "  $($parentName)  $($name)"
             }