the version you wanna download depends on what computer you're using, they're all the same game just packaged differently to fit different ports.
if your computer is running Windows, download MazinLauncher.zip.
if you have Linux download LinuxOSbuild.zip, and for Mac download MacOSBuild.zip!
currently only MazinLauncher (Windows) auto updates, for other versions you'll need to redownload the game to get the new content, but your data will remain!