You can not downgrade from Licensed Windows 10 to 8.1... I would stay on Windows 10 because you will have more feature than windows 8.1.. What they did Metro together Windows 7 and 8.1 together and then do better on Win 10.. But once again you can disable Privacy tweaks tools will stop the problem.. Note: If anyone who has previously 8 or already update to 8.1 then free download Upgrade no cost.. Good Luck..