@TeeGee Fellow member of the Oldies Club here, so I know where you're coming from! I held off Windows 10 until a couple of years ago, when I reluctantly uploaded Windows 10 to my nine-year-old HP desktop. The upload/installation went without a hitch. It took a deal of fiddling to get rid of the child's nursery 'tiles' to get the W7 appearance back onscreen and I still think the W7 interface was easier but maybe it's just that I take a long time to get used to new things.
On the upside, W10 has run quietly in the background, updating itself with no problems so far, and I don't give it a thought. Its biggest advantage is its built-in Windows Defender, which independent sites now rate up there with expensive anti-virus. Downside: none that this simple soul can find so far.
As to legacy programs, our 20-year-old copies of Photoshop and QuarkXpress run perfectly on W10.
As to Firefox, we ditched it last year after countless updates which rearranged our home screen so we had to fiddle about to retrieve the old one, and gizmos such as skins and layouts and features which we don't understand save that we don't need them for our simple requirements. In particular, Firefox would not display our Plusnet accounts so we had to use Edge or Chrome. We have found DuckDuckGo an excellent replacement, it's simple to manage and with better privacy.
In summary, you seem to be in our position of a couple of years ago. Back in your shoes I would do the same things again. By the way, if your computer is getting past it like myself we have a fix for that as well ...
Mike
