UE 4.21 initializing stuck at 18 %

First time using Unreal Engine (4.21.1) and I just installed it. Worked fine.
Now I’m trying to launch it but the loading screen has been stuck at 18 % for some time now. My task manager shows nothing. Should I just wait for it to load?

I’m using a mid-2012 Macbook, MacOS 10.13.5.

be sure to check disk permissions, another guy more recently had something similar and that fix their issue.