I've tried several existing programs and one printer so far.
On the printer, I've got an Epson Workforce WF3540, only 2 years old I guess, so it may not be a good example, but it was installed by Windows without my installing any drivers/software from the manufacturer. I've not tested scanning, but it does see that it's an all-in-one already.
I had a couple hiccups with drivers/device software so far on an Asus laptop, but nothing major. For instance, the shortcut keys with the Fn keyboard button have not all worked correctly so far. There may be a fix or better driver out there that I've not found yet, but so far those are flaky. Not a super big deal, b/c I rarely use them anyway. That's an Asus with a 3rd generation i7 to get an idea on model timing. I also tried on an HP laptop, 1st generation i3 processor, and so far, best I can tell it's all good. I haven't checked the little things there yet such as the keyboard hotkeys, but all in all working well.
Software seems to all work. There might be something that doesn't, but I'd be shocked if anything from Adobe didn't work on Windows 10. Any major vendors surely will work fine.
[ol 1]
[li]If you have major concerns, and know enough of what you're doing or feel comfortable trying, you could:[/li]
[li]Create a system image back up of your current isntallation[/li]
[li]Then do the Windows 10 Upgrade in place first[/li]
[li]Test it out[/li]
[li]I guess you could also image the Windows 10 Upgrade in case you run into issues going backward as far as Windows activation.[/li]
[li]If you have problems, then overwrite your upgrade with your previous windows image. I've read somewhere mentions of people having issues reverting back to previous windows versions from 10, as far as using the feature from within Windows 10.[/li]
[/ol]
"But thanks be to God, which giveth us the victory through our Lord Jesus Christ." 1 Corinthians 15:57