Hello! Few days before, when Windows 8.1 preview became available, I tried to install it to my PC. I had installed Windows 8 Pro EN-GB and then activated it via KMS and then used the WMC Upgrade key when Microsoft offered. When I tried to install the Upgrade via store, it gave me error, which I resolved via the Registry Tweak and converted my installation to EN-US. After that I upgraded to Windows 8.1 Preview via Store. When I logged into Windows 8.1 the first time, my activation broke up and said that key was illegal (I activated Windows 8 Pro WMC in the very beginning when Microsoft didn't block anything). I then tried to use Advanced Tokens Manager to restore the activation but that didn't help as it said that I'm using a different version. After that I had to reinstall Windows 8 Pro WMC via the MSDN ISO and then had to activate via Advanced Tokens Manager. It is now working fine but I wish to know if there is a way I can use Windows 8.1 Preview which is activated or cracked by some means?