Desktop 1.2.8 stuck on install (MacOS)

I was happily running Neo4J desktop 1.2.7 on my Mac (Mojave). I then did an in-place upgrade and found that when I tried to Create Database using latest v4.0.4 driver it just hung and wouldnt create at all. Ive then tried to uninstall everything and install version 1.2.8 desktop and it now hangs on installation at the Preparing Application stage - its been running for 3 hours. Ive been looking at Console but dont see anything that would suggest what is causing the issue.

Attached screengrabs. Can anyone advise please?