UE crashed when i hit the Launch button from the Launcher

Development Platform & Builds
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1

Hi,
I am not able to open up my unreal engine from the launcher. It just crashed when I hit the lunch button from the Launcher.

I use …

Unreal Engine 4.26.1.
Mac os X El Capitan version 10.11.6.
ATI Radeon HD 5770 1024 MB graphics.

Thanks,
Jin