HI, i am using a mid-2012 MacBook Air with OSX 10.9.5. The other OS on board installed via Boot Camp is 64-bit Windows 8.1 Pro, activated using the KMS way via MTK app (ver 2.1.1, i think) downloaded from this forum. Have got the windows 10 message bugging me to upgrade when i am in Win8 environment. Question is can I do the upgrade when I am in Windows 8 or must I start from OSX and load Boot Camp? If I have to do it in OSX, how do I access the Microsoft software that will allow me to upgrade Windows to Win10? If I do it from Windows 8, will the upgrade follow through to full upgrade to win10 AND stay activated? Pls advise.