el-gr only x64 pro ..but only for clean installation works 100% some people try make upgrade says error can find if you have enough space for installation..
Afaik it only asks for a key if you Upgrade Home to Pro, then key install is mandatory, else you can 'Skip' the key install.
i think in upgrade win 7 pro/ultimate => win 10 pro don't ask keys ...if you try upgrade win 7 pro/ultimate => win 10 ent/educ maybe asking about key..in upgrade
When you upgrade edition, it doesn't have the gVLK package that enterprise build normally has. You can just use the gVLK. Alternatively, you can /set-productkey with dism and re-iso the thing.
Thank you anyways FaiKee had mentioned that to me Just wanted to make sure I wouldn't loose my activation