I can also stop insider builds in advanced Windows Update settings! Rebooting now to see if I'm still activated after doing so. This will confirm once and for all the question of whether people with insider builds who didn't upgrade from Windows 7/8/8.1 got a free license. If you didn't do an upgrade install from a previous version of Windows to the Insider Preview, check slmgr /dlv and see if there's an expiration date and see if your key is still a generic key.

Run slmgr /dlv in a command prompt to see your partial key. I upgraded from a genuine Windows 8.1 to Build 10162, and I seem to have gotten a unique product key for Windows 10 now that I'm on Build 10240. Still don't know the behavior on Insider systems that didn't upgrade from 7/8/8.1. So if you upgraded from Win 7/8/8.1 Pro to Windows Insider Preview Pro and you want to clean install RTM, it should be safe to use the ISO posted in the other thread and this key to activate.

Seems like it will activate any computer that is marked in Microsoft's system as having been upgraded. For Pro, it's VK7JG-NPHTM-C97JM-9MPGT-3V66T, thanks /u/plectid. After you successfully complete an upgrade, Microsoft will have your HWID stored in their activation servers you can just skip product key entry during clean installation later (you'll automatically be activated under the generic key).ĮDIT 4: It is a generic key. Even if if your 10 Preview wasn't an upgrade from 7, 8, or 8.1 and even if you disable Insider builds: this is contrary to what Microsoft said. EDIT 5: The popular theory online seems to be that as long as your hardware was legitimately updated to 10240 from an activated version of Windows 7, 8, 8.1, or 10 Preview, you will have an activated Windows 10 RTM.

Windows 10 pro 10240