At least until macOS Mojave 10.14.4, a user could run any application on a Mac, signed or not, by right clicking it in Finder and manually selecting Open.
Does this still work for all applications when running macOS Mojave 10.14.5, which has more strict code signing requirements (i.e. Notarisation)?
Best Answer
Applications that have not gone thru Apple's Notarization process can't be run on Catalina and above. According to Apple's information to developers:
As of this writing, there hasn't been any published way to go around the Notarization process to run applications.
Update: To address concern about older software not running, Apple has also stated this in their Support doc:
I'm reading that last quote to mean only new software and not existing code. I think we need more clarification from Apple on what happens to existing applications.