Hi, I'm Julian. How long has it been stuck at 12%? Has it been more than an hour? If so, you may try these steps:
- Restart your PC and try the update again through Settings > Update and Security > Windows Update.
- Run the Windows Update Troubleshooter here https://support.microsoft.com/en-gb/windows/windows-update-troubleshooter-19bc41ca-ad72-ae67-af3c-89ce169755dd.
- Free up space on your drive and disconnect unnecessary USB devices before retrying.
- If it still won't progress, you can use the Windows 11 installation Assistant. Click here https://www.microsoft.com/en-us/software-download/windows11.
The provided link is in English, please use a translator tool if needed.
Hope this helps.