I dual boot to 2 different windows 7 installs. I have my primary for day to day stuff and the second install is for my DAW. I don't want to update the DAW to 10 because of the issues it may cause. I do want to update my primary install to 10. Can this be done or will I run into issues since the DAW install is BIOS?

My motherboard does have a Legacy and UEFI mode.