Need to activate Windows 8.1? Use your Windows 8 key August 29, 2013 by admin Tweet If you have downloaded a leaked copy of the Windows 8.1 RTM but need to activate your install, you can use your Windows 8 key to remove the watermark from your desktop. Read more… Neowin Related Posts:PSA: You can still activate Windows 11 using Windows 7 keysYou can no longer activate new Windows 11 builds…Windows 7 and 8 keys can no longer activate any…Want to remove the Windows 11 "System requirements…How to remove news from Windows Widgets in Windows 11?