Quarian

Question: am on Mojave/10.14.6 with MAS versions of Designer and Photo installed. Upon opening 1.8.4 two days ago, I was greeted by a window that informed me that updates were available from the MAS, but--when I clicked the button to download--the MAS indicated that it could not download the updates. Not a problem for me. I'd bought the Mac versions of all three Affinity softwares a while ago  from the Affinity store in anticipation that this might happen someday, so I deleted the MAS versions and downloaded the Mac .dmg files from the Affinity store. My question is this: did the MAS versions stop working on Mojave (and possibly below Mojave) when they were upgraded for Apple Silicon and Big Sur?