Thanks for the reply. I didn't have it installed, and I deleted the apk and redownloaded it, but I get the same error. Other apks I've downloaded install fine.
I'm in the same boat with a lot of games on here. It's mostly the ones hosted externally but there are a few that I can neither update nor install through the Windows client at all and have to download and install them manually. This is one of them. Nothing shows up under the "Install" dropdown.