I'm on Windows (10 I believe) and I assumed it wasn't a development problem. All the games were from different developers, so I assumed it had to be something I was doing or something with my computer (not discounting what you're saying, just explaining my thoughts). Two of the games were Monstrata Fracture and The Heart of Tales. I don't remember the others, I think I must have assumed I couldn't play them and deleted them from my collections.