@Richard_Lanyon For your information, it happened to me this morning — right after a brief Windows Security popup saying that an app would only be partially usable, or something like this (was too quick to take a screenshot)
But I checked and nothing was showing up in the Windows protection history… I tried Dorico 5 which launched normally.
I rebooted the computer, same thing. Then, after a few attempts (I’m not exactly sure what I did), it finally worked, without resintalling anything…