Use the 1.0.3 link, that's the latest GOG version. The Steam version is most likely identical, since the devs release at the same time on both platforms, but I haven't really tested it. I bought it on GOG (if you like the game, do the same) and use that version.
For downloading use download managers like JDownloader2, they make your likfe a lot easier.
Ok thanks for the answer! I'll try that! I'm also gonna have to check what GOG is because I've never heard of that before