the itch.io desktop app repeatedly says it can't install the demo because the build is undefined. 

I've got the same issue - the "install" option to select the build in the desktop app is blank, as if there are no selectable options. I would really prefer not to have to run this off a manually unzipped folder somewhere, so fixing the installer would be lovely.

Hey sorry as it is just an exe file, I don't think we can do installs.