Agenda stopped working on older Mac

What I did: installed update to 19.2

What happened: Agenda stopped working. There is a system notice on starting the App: Agenda not compatible with this version of MacOS - update MacOS, reinstall Agenda, contact Developer.

I tried all the usual Mac trouble shooting, reinstalled Agenda, started Agenda in safe mode but same error each time.

What I expected: Agenda 19.1 was working fine until this update to 19.2.
I depend on Agenda for mission critical material and functionality. None of it is accessible now.

If the latest Agenda update is incompatible with my MacOS it should have warned me before installing or allowed me to revert to previous.

Things that might be helpful to know (Agenda version, OS and model, etc):
Agenda version 19.2 not working, 19.1 was working.
MacOS 10.14.6 (Mojave) on MacBook Pro 15in 2018
I have important legacy Apps on this laptop so updating the MacOS is not an option.

Agenda 19.1 was working so if 19.2 is not compatible, I would like to revert to 19.1.

Many thanks for your prompt attention.

Sorry. We had some issues. Please install 19.2.1