Implement reversible Sentinel beta foundation

installer/update-ocsentinel.ps1

@@ -96,14 +96,23 @@ function Compare-Version {
         [Parameter(Mandatory)][string]$Right
     )
 
-    try {
-        $leftVersion = [System.Version]$Left
-        $rightVersion = [System.Version]$Right
-        return $leftVersion.CompareTo($rightVersion)
-    }
-    catch {
-        return [string]::Compare($Left, $Right, $true)
+    $pattern = '^(?<version>\d+(?:\.\d+){0,3})(?:-(?<prerelease>.+))?$'
+    $leftMatch = [regex]::Match($Left, $pattern)
+    $rightMatch = [regex]::Match($Right, $pattern)
+    if ($leftMatch.Success -and $rightMatch.Success) {
+        $numericComparison = ([System.Version]$leftMatch.Groups['version'].Value).CompareTo([System.Version]$rightMatch.Groups['version'].Value)
+        if ($numericComparison -ne 0) {
+            return $numericComparison
+        }
+
+        $leftPrerelease = $leftMatch.Groups['prerelease'].Value
+        $rightPrerelease = $rightMatch.Groups['prerelease'].Value
+        if ([string]::IsNullOrWhiteSpace($leftPrerelease) -and -not [string]::IsNullOrWhiteSpace($rightPrerelease)) { return 1 }
+        if (-not [string]::IsNullOrWhiteSpace($leftPrerelease) -and [string]::IsNullOrWhiteSpace($rightPrerelease)) { return -1 }
+        return [string]::Compare($leftPrerelease, $rightPrerelease, $true)
     }
+
+    return [string]::Compare($Left, $Right, $true)
 }
 
 function Get-Sha256Hex {