Fix Windows installer Python detection

Author: mbv06

install-windows.ps1

@@ -33,16 +33,40 @@ function Log($Message) {
     Write-Host "`n==> $Message" -ForegroundColor Cyan
 }
 
+function Test-ShouldPauseOnExit {
+    try {
+        if (-not [Environment]::UserInteractive) { return $false }
+        if ($Host.Name -ne 'ConsoleHost') { return $false }
+
+        $commandLine = Get-CimInstance Win32_Process -Filter "ProcessId = $PID" -ErrorAction Stop |
+                       Select-Object -ExpandProperty CommandLine
+        if (-not $commandLine) { return $false }
+
+        return $commandLine -match '(?i)(^|\s)-(c|command|file|encodedcommand)\b'
+    }
+    catch {
+        return $false
+    }
+}
+
+function Wait-BeforeExit {
+    if (Test-ShouldPauseOnExit) {
+        Write-Host ''
+        Read-Host 'Press Enter to close this window' | Out-Null
+    }
+}
+
 function Die($Message) {
     Write-Host "Error: $Message" -ForegroundColor Red
+    Wait-BeforeExit
     exit 1
 }
 
 function Test-PythonCompatible($PythonPath) {
     try {
-        $version = & $PythonPath -c 'import sys; print(f"{sys.version_info.major}.{sys.version_info.minor}")' 2>$null
+        $version = & $PythonPath -c 'import sys; print(sys.version_info.major); print(sys.version_info.minor)' 2>$null
         if (-not $version) { return $false }
-        $parts = $version.Split('.')
+        $parts = @($version)
         $major = [int]$parts[0]
         $minor = [int]$parts[1]
         return ($major -gt $MinMajor) -or ($major -eq $MinMajor -and $minor -ge $MinMinor)
@@ -174,4 +198,13 @@ Done! Slicer URI Bridge is installed.
 "@
 }
 
-Main
+try {
+    Main
+}
+catch {
+    $message = $_.Exception.Message
+    if (-not $message) {
+        $message = ($_ | Out-String).Trim()
+    }
+    Die $message
+}