There doesn't seem to be any file to install and play the game, for some reason o.o
That's where I went to grab it the first time. Unfortunately, nothing is listed from the dropdown menu.
And trying to download the game from a web-browser just shows the "Thank you for downloading" message without actually providing any download. I've downloaded at least two dozen games for this IGMC2018 and only two entries have had this issue for me so far. :(