From within Windows 8.1 Created a new folder c:\installwim within this folder created a further folder called "MOUNT" copied the install.wim file into the c:\installwim folder Then opened a command prompt (admin) copied and paste this command to mount the image: DISM /Mount-Wim /WimFile:c:\INSTALLWIM\install.wim /index:1 /MountDir:c:\INSTALLWIM\mount Manually delete my tokens.dat & data.dat files below: c:\INSTALLWIM\mount\Windows\System32\spp\store\2.0 copy and paste this command to commit the changes made: Dism /unmount-wim /mountdir:c:\installwim\mount /commit And add EI.CFG on the windows source and add this install.wim to replaced burn iso and enjoy Windows 8.1 Pro RTM x64 with no activation at all (just like old Windows 95/98SE without activation) There won't be any product key or activation. My mate told me to try this, but I haven't try it. I will try it later when I get home. Worth a try to see if it does work. If it doesn't can the mod of this forum removed this thread.