Hello, I have the same problem. I noticed my Affinity Photo was still running 1.7.x and wasn't updating from the Mac App Store where it was originally purchased. When I go to the App Store, it shows the icon to download and install the app (i.e. not purchase or update). However, when clicking on the install icon, it just spins. No download is started. I have tried restarting the Mac, logging out and back into the App Store, etc. I spent an hour with Apple's online support and they couldn't figure it out. In the end, they said to contact Affinity for help as they said they "did everything they could think of". So where do I go from here?