itch.io

Only works on Android! Search for "How to install an .apk"

Usually, if you download the new versions while the old are installed, it will prompt you to update to the new version when you run the new apk. This (usually) keeps the save paths and data still intact when you want to play the new content. 

I have found very few games on here that do not update properly, most will just automatically opt to do the update when you go to install a new version.