Using a Microsoft link
https://www.microsoft.com/en-us/software-download/windows10 using the 'Media Creation' tool which allows 'clean install' or 'retain existing files install' I upgraded the following ...
My Toshiba Satellite laptop from W8 to Win10 been running it 2 weeks.
An old Compaq laptop (with damaged screen ) W7 to W10 very smooth upgrade running well.
My granddaughter's Asus Laptop with a touch screen W8 to W10 so far so good.
My oldish W7 desktop to W10 and then an immediate downgrade back to W7.
The display adapter driver in it was unknown to W10 which inserted a generic driver and I got the dreaded flashing screen.
It was not easy to do the downgrade with a flashing screen.
If interested in the tech details....
I would have to jump through some complicated hoops to fix my desktop for W10 see Microsoft info here.
https://answers.microsoft.com/en-us...y/3f0e7638-f24f-40de-a4b6-6a80aa814b42?auth=1
Some folks have had some very bad experiences with computers made unusable, read the later posts in a thread in Pcadvisor.
https://www.pcadvisor.co.uk/forum/windows-29/flashing-screen-after-windows-10-upgrade-4538547/
Some Googling will show that Microsoft have acknowledged a 'flashing screen' issue for some people using W10 and suggested a 'fix'.
I can run W7 and W10 side by side and I find there is nothing significant that W10 can do which W7 cannot do.
So my desktop computer will stay with W7.