Just an update on progress. Having ordered the Ryzen i5-3600, which was a series 3 I found most of the 450's didn't show the series 3 as an option, maybe as they were showing old data. Anyhoos, I bit the bullet and ordered an Asus AM4 TUF x570 (wi-Fi) ATX, and 2x 8GB DDR4-3200 UDIMM, I already have a passive Graphics card, so hopefully it will all be compatible, and I can then finally complete the update to Win10. It's registered etc, but just freezes after a minute or two, and the Z87 chipset was marked as not being compatible, and mine being Z77 I guess it's the same issue.
Now I have figured out what most of the terms mean, and which things are backward compatible, Having reached an elevated age, I hopefully will not need another update until I am in my box.
Thanks for giving me the starting point.