Launcher will not load UnrealEngine. macOS

Hi

Just downloaded the launcher and unreal engine - but I click launch - the yellow button in the launcher says “Please Wait…” a split second before the launcher window disappearing.

it hasn’t crashed, as the launcher is still active in the bar.

When I click on laucher again, the yellow button says Launch Unreal Engine - as if nothing is happening.

any ideas?

Is it a simple problem with my system not being accepted? or something else? Not a great start when I want to dive and learn the software.

cheers

macOS High Sierra | 10.13.6 | 3.4ghz intel core i5 | 8GB memory | Graphics: Radeon Pro 560 4096 MB