Just a short status, I will edit this later: it's not a .gz file, it's a .tar, I got an error (File Roller/Gnome) unpacking it. Removing the suffix made it accessible.
After downloading dotnet3.5 some unpacking happens but then the setup of dotnet errors out with a requester (Setup.exe discovers...blah...need to close...). Your installation routine continues regardless, but when I start the game I get some error requesters pointing to the file I added. The license-requester pops up and the music plays, but then it quits to desktop when I close the requesters.