How to install Windows 11 on Unsupported PC

USB Installer:

If you do not have a Windows 11 USB Installer already then check out Microsoft’s official page for creating an installer USB.

⚠️ Note:
These methods force Windows 11 to install on unsupported hardware. It will run, but Microsoft may not provide updates in the future (though in practice updates often still work).

Some older computers may fail with Windows 11 so it is best to use two different drives. One drive to hold the original Operating System before the Windows 11 install/ The second drive with the new Windows 11 install. This is so you have a fail-safe in case Windows 11 has too many issues with your pc’s hardware.

⚠️ Disclaimer

Before proceeding, understand that installing Windows 11 on unsupported hardware comes with risks:

• Microsoft does not officially support these installs.
• You may not receive all updates in the future which is a security concern!
• Your PC could run into stability or compatibility issues.

That said, many users successfully run Windows 11 on older hardware without problems. Proceed at your own discretion.

During Install:

If you’re already booted into the Windows 11 installer from a USB and it refuses to proceed (usually because of hardware requirements like TPM, Secure Boot, or unsupported CPU/RAM), you can bypass the checks directly inside the installer. Here’s how you can force it to install:

1. Registry Edit in Setup

1. When you reach the screen where the installer blocks you (e.g., “This PC can’t run Windows 11”), press Shift + F10 to open a Command Prompt.
2. Type in the commands below.

reg add "HKLM\SYSTEM\Setup\LabConfig" /v BypassTPMCheck /t REG_DWORD /d 1 /f
reg add "HKLM\SYSTEM\Setup\LabConfig" /v BypassSecureBootCheck /t REG_DWORD /d 1 /f
reg add "HKLM\SYSTEM\Setup\LabConfig" /v BypassRAMCheck /t REG_DWORD /d 1 /f
reg add "HKLM\SYSTEM\Setup\LabConfig" /v BypassCPUCheck /t REG_DWORD /d 1 /f
exit

2. Continue Installation

• If at the screen telling you that your computer is unable to upgrade to Wx 11. Press the back button and select the Windows version desired.
  • If on the install window that requests a key. Click I don’t have a product key.
• Select the OS version to install and click the Next button.
• Accept and Click Next on the License Terms.
• Select Custom. The Upgrade option leads to a dead end.
• Select the desired drive and select next.
• The installer should now skip the checks and allow you to proceed with installing Windows 11.

2. OOBE

OOBE stands for Out Of Box Experience and is a method that computer repair companies can push updates to a computer before handing it off to a customer who can then create their account and set up their computer without needing to push updates for Windows or Hardware. Simply press Ctrl + Shift + F3 at the same before starting the initial computer/account setup.

Ctrl + Shift + F3

Modify the USB:

Modifying the USB installer is a cleaner solution than making registry edits during setup. By adjusting configuration files before installation, Windows automatically skips the Microsoft account requirement without risky command-line workarounds. This makes the process faster, repeatable, and less prone to errors.

Step 1: Create the Windows 11 Bootable USB

If a Windows 11 Installer USB is already created skip down to Step 2.

1. Download the Windows 11 ISO from Microsoft.
2. Remove all storage devices except for the deticated USB you want to turn into an Windows 11 Installer drive. This will help ensure data is not accidentally wiped or deleted.
3. Use Rufus or the Media Creation Tool to write the ISO to your USB drive.
   • With Rufus, choose your USB, select the ISO, and click Start.

Once complete, you’ll have a bootable Windows 11 installer USB.

Step 2: Locate the sources Folder

1. Open the USB drive in File Explorer.
2. Find and open the sources folder.
3. Inside, look for the file named: appraiserres.dll

This file is responsible for running the hardware compatibility checks during installation.

Step 3: Remove or Replace the File

To bypass the checks:

• Option A: Delete appraiserres.dll.
• Option B: Replace it with an empty file. (Right-click → New → Text Document → rename it appraiserres.dll with 0 KB size).

Either option will disable the compatibility scan.

Step 4: Boot and Install Windows 11

1. Safely eject the USB and insert it into the computer you want to upgrade.
2. Boot from the USB (usually by pressing F12, F10, or Esc at startup). The button to initiate boot options differs per motherboard.
3. Follow the normal Windows 11 installation steps.

The installer USB will now skip the hardware checks and allow you to install on unsupported hardware. No need to edit the registry every time you perform an upgrade!

Final Thoughts

By removing or replacing the appraiserres.dll file (or using Rufus’s bypass feature), you can create a Windows 11 installer USB that works on older hardware. This allows you to breathe new life into PCs that Microsoft considers “unsupported,” even though they are still powerful enough to run the latest operating system.

If you want to get the most out of Windows 11 on older hardware, consider disabling unnecessary background apps and enabling performance settings once installed.