Need to reinstall win 10 in U book pro

my U Book Pro update the windows to Win 11
but unfortunately I have an app work only in Win 10
how can I re install an activated windows 10
looking for soonest support
best Regards

If you’re fast enough (within 10 days of updating) you can actually roll back the Windows 11-upgrade.

After those 10 days, the windows.old folder (which contains your old Windows 10-install) gets deleted automatically to regain disk space.