I'm a member of GOG.com, the last game I bought from them was Anno 1404 Gold Edition, Windows 10\11 compatible as well. They haven't got a selection like Steam has but, I've never used Steam so I'm not bothered about that.
https://www.gog.com/en
There are two options to download a game.
Option 1,
INSTALL GAME WITH GOG GALAXY, if anything happens to your PC you have to download it again.
Option 2,
Download offline backup game installers, (best option) two files, burn to DVD and you've got it forever.
