As the title says. I can only download the changelog and I've never downloaded this game before. I can see the other options in the development log but I can't download them since they only bring me back to the first screen whenever I press "download now" which only lets me get the changelog. Is there some other way to get the game that I've missed, cuz I don't want to illegally download this game

Maybe your screen shows something different but you should see a tab towards the top of this page that says, "Game". 

If you click that, you should be brought to a page with the different versions you can download, just click the word "download" that appears above the version you want.