My free 8 WMC key succesfully upgraded and activated my WIN10 install... but... It rebranded the entire thing as Windows 8.1 hahah Also, did anyone else have issues installing the preview? I couldnt get it to install with any of the normal 3 routes (setup.exe, sources/setup.exe, or booting from USB, I had to use DISM to apply the image to my HDD partition...)
It suprises me that wmc is still there as an option to upgrade!! And media center its really old looking and dated!! Either they leave that SKU Behind in the past or have something else for media center lovers up there sleeve..
You can still use 8.1 GVLK keys for activation and install etc as well. This wont change until RTM I assume, or close to RTM
Yes, pointed that out earlier: 954411. However upgrading to ProfessionalWMC is not recommended, as it seems only Professional and Enterprise allowed in the Insider Program (Preview builds page in settings will give you an error (0x800700ea) instead of explicitly wording that there are no builds)