fix: version checks

install.ps1

@@ -93,7 +93,10 @@ function Get-InstalledVersion {
 
     try {
         $output = & $Command $VersionArg 2>&1 | Select-Object -First 1
-        return $output.ToString().Trim()
+        if ($null -ne $output) {
+            return $output.ToString().Trim()
+        }
+        return $null
     }
     catch {
         return $null
@@ -132,7 +135,10 @@ function Install-Package {
             # Extract semantic version numbers only - stop before any non-digit/non-dot characters
             # This extracts "2.52.0" from "2.52.0.windows.1"
             if ($version -match '(\d+)(?:\.(\d+))?(?:\.(\d+))?') {
-                $installedVersion = $matches[1] + "." +$matches[2]
+                $major = $matches[1]
+                $minor = if ($matches[2]) { $matches[2] } else { "0" }
+                $patch = if ($matches[3]) { $matches[3] } else { "0" }
+                $installedVersion = "$major.$minor.$patch"
                 try {
                     if ([version]$installedVersion -lt [version]$MinVersion) {
                         Write-Warning "Version $installedVersion is below minimum required version $MinVersion"
@@ -313,8 +319,8 @@ function Get-SystemPrerequisites {
 
                     $minParts = $tool.MinVersion.Split('.')
                     $minMajor = [int]$minParts[0]
-                    $minMinor = if ($minParts[1]) { [int]$minParts[1] } else { 0 }
-                    $minPatch = if ($minParts[2]) { [int]$minParts[2] } else { 0 }
+                    $minMinor = if ($minParts.Length -gt 1) { [int]$minParts[1] } else { 0 }
+                    $minPatch = if ($minParts.Length -gt 2) { [int]$minParts[2] } else { 0 }
                     $minVersion = "$minMajor.$minMinor.$minPatch"
                     
                     if ([version]$installedVersion -lt [version]$minVersion) {