I purchased SimplePlanes through Gumroad on this very link:
https://gumroad.com/l/SimplePlanes

And the only download option I was given was to download a txt file named 'SimplePlanesNowOnSteam.txt' which gives me the link to purchase SimplePlanes on Steam. So did I basically pay for a notepad file that redirects me to Steam? There's also an option to 'Download All' and if I save the file to my dropbox or download a ZIP file I just get another txt file this time named 'SimplePlanes_PC (3).txt', except this txt file is completely empty and just as useful as the former. There's also an option do download the Gumroad Library app for my phone but that seems counterproductive if I purchased a PC product.

So in this case, was I /not/ supposed to purchase from Gumroad?