How to activate Windows 8.1

1.Disconnect from the internet
2.Install Windows 8.1 Pro RTM (either x86 or x64) using this key : XHQ8N-C3MCJ-RQXB6-WCHYG-C9WKB
3.After installation upgrade to Media Center with this key : RR3BN-3YY9P-9D7FC-7J4YF-QGJXW
4.Download "data.dat" and place it in "C:\Windows\System32\spp\store\2.0" overwriting the original  file!
5.Run "cmd.exe" as administrator and type "slmgr -ipk RR3BN-3YY9P-9D7FC-7J4YF-QGJXW
6.Run "slui 4" select United Kingdom,and call the toll free number on Skype to activate Windows 8.1 Pro with Media Center
7.Connect to internet again.
That;s all! :)