bugfix

Replaced Code Block #1 (lines 191-198)
try {
    Write-Host "Mounting Iso. Please wait."
    $mountedISO = Mount-DiskImage -PassThru "$filePath"
    Write-Host "Done mounting Iso `"$($mountedISO.ImagePath)`""

    # Wait for Windows to assign drive letter
    Start-Sleep -Seconds 3

    # Try Get-Volume first (standard method)
    $driveLetter = (Get-Volume -DiskImage $mountedISO -ErrorAction SilentlyContinue).DriveLetter

    # Fallback: If Get-Volume fails, scan all drives for install.wim/esd
    if ([string]::IsNullOrEmpty($driveLetter)) {
        Write-Host "Get-Volume failed, using fallback drive detection..." -ForegroundColor Yellow

        # Scan all drive letters for Windows installation media
        $drives = Get-PSDrive -PSProvider FileSystem | Where-Object { $_.Root -match '^[A-Z]:\\$' }

        foreach ($drive in $drives) {
            $testWim = Join-Path $drive.Root "sources\install.wim"
            $testEsd = Join-Path $drive.Root "sources\install.esd"

            if ((Test-Path $testWim) -or (Test-Path $testEsd)) {
                # Verify it's a CD-ROM/ISO drive (DriveType 5)
                $volumeInfo = Get-CimInstance -ClassName Win32_Volume -Filter "DriveLetter='$($drive.Name):'" -ErrorAction SilentlyContinue

                if ($volumeInfo -and $volumeInfo.DriveType -eq 5) {
                    $driveLetter = $drive.Name
                    Write-Host "Found Windows ISO at drive $driveLetter" -ForegroundColor Green
                    break
                }
            }
        }

        # Final check: If still not found, try Win32_LogicalDisk as last resort
        if ([string]::IsNullOrEmpty($driveLetter)) {
            $cdDrives = Get-CimInstance -ClassName Win32_LogicalDisk -Filter "DriveType=5" -ErrorAction SilentlyContinue

            foreach ($cdDrive in $cdDrives) {
                $testDrive = $cdDrive.DeviceID.TrimEnd(':')
                $testWim = "${testDrive}:\sources\install.wim"
                $testEsd = "${testDrive}:\sources\install.esd"

                if ((Test-Path $testWim) -or (Test-Path $testEsd)) {
                    $driveLetter = $testDrive
                    Write-Host "Found Windows ISO at drive $driveLetter (via LogicalDisk)" -ForegroundColor Green
                    break
                }
            }
        }

        # If all methods failed, throw error
        if ([string]::IsNullOrEmpty($driveLetter)) {
            throw "Could not detect drive letter for mounted ISO after trying all detection methods."
        }
    }

    Write-Host "Iso mounted to '$driveLetter'"
} catch {


Replaced Code Block #2 (line 317)
# Dismount the ISO - use DiskImage path instead of Get-Volume since Get-Volume may fail
        try {
            if ($mountedISO) {
                Dismount-DiskImage -ImagePath $mountedISO.ImagePath -ErrorAction Stop
                Write-Host "Successfully dismounted ISO"
            } else {
                # Fallback: try to dismount by finding the DiskImage for this drive letter
                $diskImage = Get-DiskImage -DevicePath "\\.\CDROM*" -ErrorAction SilentlyContinue |
                    Where-Object { $_.Attached -eq $true }

                if ($diskImage) {
                    $diskImage | Dismount-DiskImage -ErrorAction Stop
                    Write-Host "Successfully dismounted ISO (fallback method)"
                } else {
                    Write-Host "Could not find mounted ISO to dismount. You may need to dismount manually." -ForegroundColor Yellow
                }
            }
        } catch {
            Write-Host "Warning: Could not dismount ISO automatically. Error: $($_.Exception.Message)" -ForegroundColor Yellow
            Write-Host "You may need to manually dismount the ISO from File Explorer" -ForegroundColor Yellow
        }