Need Help to convert win8.1 rtm to Win8.1 WMC and preserve the activation ?

Hi,Guys

I have an Windows 8 With Media Center Activated since November 2012 and i have not any problem , now i want to upgrade to win8.1 WMC

this what i downloaded

"Windows_8.1_EN-US_x64.ISO"



i need some help from you guys
-How to convert Win8.1 rtm to wmc ?
-Upgrade from win8 wmc to win8.1 wmc and preserve the activation ( i have more than 3 PCs i cant include the data files in each .ISO) ?



waiting

 

I know there are some threads about converting the win8.1 rtm to wmc but they are for x86 or download links not available or it need win8.1 preview .....

 

Any One Can help ? and make a good tutorial ?

 

I know s1ave77 , but this nice thread is for win8.0 not 8.1 ,and yes i have a fully activated win8 with office 2013 , so what to do ?

Thanks

 

okay , will try it out now , reporting back in 1-3h

 

!You will nee Windows 8.1 Pro WMC Activated data.dat and tokens.dat files!
win8.1 or win8.0 ? if i had 8.1 so why i will make this thread ??

 

Just Finished Building My Clean ISO With Net Framework 3.5 (with stock data files ), then testing the iso in Virtual Machine then do my tricks in my main powerhouse

 

Done, Thanks to All.
Upgraded from win8.0 pro wmc with office 2013 to win8.1 wmc with office2013 Fully activated with my wmc key ,
but i want to know , is there any way to activate my office with my old (win8.0 pro wmc with office 2013 activation backup ) or even i have a back up of office 2013 activation from win7 ?

 

Any way , i activated the office too now (via phone) , i dont know but maybe the activation is kept when upgrading (even i replaced the data files in spp\store\2.0)
Thanks to anyone who helped