Strangely enough, even that threw up a warning from Avast, "Win32:Evo-gen [Susp]". I managed to get the file, tried extracting it, and then Avast threw up another warning when I tried extracting it, blocking the extraction process and causing it to fail, so back to square one.
What on earth is in this specific game that's got Avast so worried? This hasn't happened with any other AGS game before.
EDIT: Scanning the file itself brings up no warnings. It's only when I try to either download it or extract it that Avast throws a wobbly.