There is no legitimate “free” full version. Unlicensed copies will shut down every hour after the grace period.

slmgr /ipk XXXXX-XXXXX-XXXXX-XXXXX-XXXXX slmgr /ato

Unlike Windows 10/11, there is for Windows Server. WSUS is for updates, not initial ISO downloads.

The most reliable way to obtain the official ISO is through the .