Had 7 on my 5+yr old laptop and 10 on the new one and zero problems with either. Happy happy joy joy remembering the fun flogging win3.1 and 95 along on a daily basis sometimes!
I upgraded an 8 year old w7 dell 32 bit laptop and a 3 year old W 8.1 64 bit dell laptop. Had a few problems with each until I did a W10 clean install on each. Both are pretty much flawless and quick after the clean install.