Had the same issue, (tried xattr -rd com.apple.quarantine, sudo chmod, gatekeeper, etc, nothing worked). All I wanted to do was access my print queue! In the end deleting the old printer apps in the Library/Printers folder and then going into System Preferences and then double clicking on the printers (as bonkers as is sounds) reinstated the printers in a couple of seconds and I was able to access the print queue again. Hope this is useful for others!