How to Upgrade Windows 10 to Windows 11 Using the ISO Method From Saner Remote Scripting Tool

# Log file in temp directory
$logFile = "C:\windows11-upgrade.log"

# ISO URLs (replace with the latest from Microsoft)
$isoDownloadUrl_en_us = "<LATEST MICROSOFT ISO LINK for English US>"
$isoDownloadUrl_en_international = "<LATEST MICROSOFT ISO LINK for English International>"

# ISO paths
$isoPath_en_us = "C:\windows11\Win11_24H2_English_x64.iso"
$isoPath_en_international = "C:\windows11\Win11_24H2_EnglishInternational_x64.iso"

# Mount path variable
$isoMountPath = ""

# Function to log messages
function Write-Log {
    param ([string]$message)
    $timestamp = Get-Date -Format "yyyy-MM-dd HH:mm:ss"
    "$timestamp : $message" | Tee-Object -FilePath $logFile -Append
}

# Start logging
Write-Log "Starting Windows 11 upgrade process..."

# Detect system UI language
$systemLanguage = (Get-WinSystemLocale).Name
Write-Log "Detected system language: $systemLanguage"

# Select correct ISO URL and path based on language
if ($systemLanguage -eq "en-US") {
    $isoDownloadUrl = $isoDownloadUrl_en_us
    $isoPath = $isoPath_en_us
    Write-Log "Using en-US ISO and download URL."
} else {
    $isoDownloadUrl = $isoDownloadUrl_en_international
    $isoPath = $isoPath_en_international
    Write-Log "Using International English ISO and download URL."
}

# Check system architecture
$arch = (Get-CimInstance Win32_OperatingSystem).OSArchitecture
Write-Log "System architecture: $arch"

# Check TPM 2.0
$tpm = Get-WmiObject -Namespace "Root\CIMV2\Security\MicrosoftTpm" -Class Win32_Tpm -ErrorAction SilentlyContinue
if ($tpm -and $tpm.SpecVersion -like "*2.0*") {
    Write-Log "TPM 2.0 is present."
} else {
    Write-Log "TPM 2.0 is missing or inaccessible."
    exit 1
}

# Check Secure Boot
try {
    $sb = Confirm-SecureBootUEFI
    Write-Log "Secure Boot: $sb"
} catch {
    Write-Log "Secure Boot: Not supported or access denied."
    exit 1
}

# Check free disk space
$freeSpaceGB = [math]::Round((Get-PSDrive C).Free / 1GB, 2)
Write-Log "Free space on C: $freeSpaceGB GB"
if ($freeSpaceGB -lt 25) {
    Write-Log "ERROR: Not enough free disk space. Exiting..."
    exit 1
}

# Create target folder if not exists
if (-not (Test-Path "C:\windows11")) {
    New-Item -ItemType Directory -Path "C:\windows11" | Out-Null
    Write-Log "Created C:\windows11 directory."
}

# Download ISO if not already present
if (-not (Test-Path $isoPath)) {
    Write-Log "Downloading ISO file from Microsoft..."
    try {
        $ProgressPreference = 'SilentlyContinue'
        Invoke-WebRequest -Uri $isoDownloadUrl -OutFile $isoPath -UseBasicParsing -ErrorAction Stop | Out-Null
        Write-Log "ISO successfully downloaded to: $isoPath"
    } catch {
        Write-Log "ERROR: Failed to download ISO. $_"
        exit 1
    }
} else {
    Write-Log "ISO already exists at: $isoPath"
}

# Mount ISO
Write-Log "Mounting ISO..."
try {
    $mount = Mount-DiskImage -ImagePath $isoPath -PassThru -ErrorAction Stop
    $attempt = 0
    $maxAttempts = 10
    $isoMountPath = $null
    while ($attempt -lt $maxAttempts -and -not $isoMountPath) {
        Start-Sleep -Seconds 1
        $volumes = Get-Volume -DiskImage $mount -ErrorAction SilentlyContinue
        foreach ($vol in $volumes) {
            if ($vol.DriveLetter) {
                $isoMountPath = "$($vol.DriveLetter):"
                break
            }
        }
        $attempt++
    }
    if ($isoMountPath) {
        Write-Log "ISO mounted at: $isoMountPath"
    } else {
        Write-Log "ERROR: ISO mounted but no drive letter assigned after $maxAttempts seconds."
        exit 1
    }
} catch {
    Write-Log "ERROR: Failed to mount ISO. $_"
    exit 1
}

# Start upgrade silently
$setupExe = Join-Path $isoMountPath "setup.exe"
Write-Log "Starting Windows 11 silent upgrade using: $setupExe"
try {
    Start-Process -FilePath $setupExe -ArgumentList "/auto upgrade /quiet /noreboot /eula accept /compat ignorewarning /dynamicupdate disable /showoobe none" -Wait -NoNewWindow
    Write-Log "Upgrade process initiated successfully."
} catch {
    Write-Log "ERROR: Failed to start Windows 11 setup. $_"
    exit 1
}

# Unmount ISO
Write-Log "Unmounting ISO..."
try {
    Dismount-DiskImage -ImagePath $isoPath
    Write-Log "ISO unmounted successfully."
} catch {
    Write-Log "ERROR: Failed to unmount ISO. $_"
}

# Final log
Write-Log "Upgrade script complete. Please reboot to finish the upgrade."

Logs

All logs are stored at:

C:\windows11-upgrade.log

Final Step