Hello! I have windows 10 home, and after a lot of consideration, I decided to downgrade to Windows 7 Ultimate, I am currently running on the Z270 chipset, and I'm aware of the driver issue, but I am going to purchase from winsupplier, I wanted to know if they are trusted. I also want to know when I do purchase Windows 7, will It be able to work on the z270 boards since its a download. I also want to know if anything goes wrong will I be able to go back to Windows 10 without using the key? Thanks!