There is no bad in putting a one-button option to download an all-in-one gaming folder for various platforms, it's affordable, but that isn't the way to detect in which platform the game has been downloaded, it's detected from the analytics (as I showed you in the previous comment), and the best way to avoid wrong downloads from the wrong operating systems, is are using Google Play model platforms for Android, App Store for iOS or Steam for PC.
P.D: I don't know what you mean with 5 different options.