Good to know you've already brought it up to them, in case they see this – Yes, this is indeed the same client I am using (which works without issue for similar games like Hayo's LD). As the picture Akinokaza posted shows, the install menu only "reads" the link for the google doc (which I suspect is because it's the first link on the download page). I wonder if moving the game guide link off of the download page to a link on the static itch.io main page (or even underneath the links for pc and mac) would fix the issue...
Thanks for the reply.