Install or Upgrade to Windows 11 on Older PCs (No TPM / Older CPU)

Simple, safe method using the official ISO and a tiny PowerShell helper. No shady downloads. Keep your files & apps.

What this does (in plain English)

• Lets you upgrade to Windows 11 even if your PC fails the TPM 2.0 / CPU check.
• Uses the official Microsoft Windows 11 ISO.
• No activators, no hacked images — just a small setup flag to allow the upgrade.

What you need

• Windows 10 already installed (64-bit).
• The official Windows 11 ISO (download from Microsoft, then double-click to mount).
• 5–10 minutes and Administrator access.

Step 1 — Copy the script

Copy the code below into Notepad and save it as Win11-upgrade-bypass.ps1 on your Desktop.

<#
Win11-upgrade-bypass.ps1
Purpose: Allow upgrades to Windows 11 on PCs without TPM 2.0 or with older CPUs.
How: Sets the MoSetup flag and launches official setup.exe from your ISO/USB.
#>
function Assert-Elevated {
$isElev = ([Security.Principal.WindowsPrincipal] [Security.Principal.WindowsIdentity]::GetCurrent()).IsInRole([Security.Principal.WindowsBuiltInRole] "Administrator")
if (-not $isElev) {
Start-Process -FilePath "powershell.exe" -ArgumentList "-NoProfile -ExecutionPolicy Bypass -File `"$PSCommandPath`"" -Verb RunAs
exit
}
}
Assert-Elevated
$moPath = "HKLM:\SYSTEM\Setup\MoSetup"
if (-not (Test-Path $moPath)) {
New-Item -Path "HKLM:\SYSTEM\Setup" -Name "MoSetup" -Force | Out-Null
}
New-ItemProperty -Path $moPath -Name "AllowUpgradesWithUnsupportedTPMOrCPU" -PropertyType DWord -Value 1 -Force | Out-Null
Write-Host "Bypass enabled. ✅" -ForegroundColor Green
$iso = Read-Host "Enter full path to your Windows 11 ISO (or press Enter if already mounted)"
if ($iso -and (Test-Path $iso)) {
try {
Mount-DiskImage -ImagePath $iso -PassThru | Out-Null
Start-Sleep 2
$drive = (Get-Volume -DiskImage (Get-DiskImage -ImagePath $iso)).DriveLetter
} catch {
Write-Host "Could not mount ISO automatically. Please mount it manually (double-click the ISO)." -ForegroundColor Yellow
}
}
if (-not $drive) {
$drive = Read-Host "Enter the drive letter where setup.exe is located (e.g. D)"
}
$setup = "$drive`:\setup.exe"
if (Test-Path $setup) {
Write-Host "Starting Windows 11 setup from drive $drive: ..." -ForegroundColor Cyan
Start-Process -FilePath $setup -ArgumentList "/auto upgrade /dynamicupdate enable" -Verb RunAs
Write-Host "When asked, choose 'Keep personal files and apps' to upgrade in-place." -ForegroundColor Yellow
} else {
Write-Host "setup.exe not found at $setup. Check the mounted ISO/USB drive letter and try again." -ForegroundColor Red
}

Copy Script

Step 2 — Run the script

1. Right-click the saved file Win11-upgrade-bypass.ps1 → choose Run with PowerShell (allow “Run as Administrator” if prompted).
2. Paste your Windows 11 ISO path when asked, or just press Enter if you’ve already mounted it.
3. The script sets the bypass and launches the official Windows 11 installer.
4. When the installer opens, choose Keep personal files and apps to do an in-place upgrade.

Want a fresh install instead?

For a clean install from USB, use this quick technique inside the Windows setup:

1. Boot from the Windows 11 USB. If it says “This PC can’t run Windows 11”, press Shift + F10 to open Command Prompt.
2. Type regedit → go to HKEY_LOCAL_MACHINE\SYSTEM\Setup → create a key named LabConfig.
3. Inside LabConfig, create these DWORD (32-bit) values and set each to 1:
   BypassTPMCheck
   BypassSecureBootCheck
   BypassRAMCheck
   BypassCPUCheck
4. Close everything, click Back → Next in setup, and continue with installation.

Made with ❤️ by Mismoosh Ltd / WM ICT Solutions — keeping good tech running strong.