Can an older version of Sunday Plus be used on Windows 10?
Compatibility of SundayPlus doesn't actually exist since the developers recommend using another application on their official website. Since I can't download the software, the logical thing to do if you have a setup package is to apply a compatibility to see if it works on Windows 10 or not. Right click the setup package and go to Properties > Compatibility then choose Run as Administrator and start the application.
You could also check the product they offer called EasyWorship.
I've been running it for years, but it's on its last legs. Its version of Biblesoft no longer will install. It's just a matter of time before Sunday Plus won't, too.