Hi @MEKI KATT ,
You can try the following method.
block windows11 upgrade
- Select Start.
- Type gpedit.msc.
- Navigate to Computer Configuration > Administrative Templates > Windows Components > Windows Update > Windows Update for Business.
- Double-click on "Select the target Feature Update version".
- Set the policy to Enabled.
- Type Windows 10 in the first field, and 21H2 in the second field.
- Select OK.