Have you ever bought a videogame on GOG.com ?
If not, I highly recommend them...everything is DRM-free, and configured to run. If they say a game will run on Windows Vista, 7, 8, and 10, by God it'll run! Lots of really great older games too (we're talking mid-80's up to now). I much prefer them over Steam.
Does it work on mobile? Amazon? Google play?
Sorry, PC and Mac only.