Windows 8.1 core/pro yang saya bagikan ini adalah versi rtm (release to macnufature) yang "dibocorkan" oleh team wzt dari russia dengan arti lain windows 8.1 core/pro ini sudah final bukan beta atau preview lagi... Windows 8.1 product activation keys list is bellow in the article. windows 8.1 is an upgraded version of windows 8 and was released in 2012. windows 8 and windows 7 users can upgrade to the recent 8.1 version without having to pay an additional license fee.. I will give windows 8.1 product key , windows 8.1 professional product key free for you . you can find below : i give you trial product but once you are satisfied and you have enough money , i highly recommend you to buy windows 8 product key to support the developers ..