– As a fallback, run slui 4 from an admin command prompt to get an installation ID and call Microsoft’s automated phone system. This still works in many regions, though support staff may try to redirect you to upgrade.
Activating is a straightforward process if you have a legitimate product key. Use the GUI for simplicity, slmgr.vbs for control, and phone activation for air-gapped networks. Always avoid shady key generators—they will compromise your server. – As a fallback, run slui 4 from