Nevermind, I'm just stupid. I thought I had the latest engine version, turns out I didn't. For future readers: the project's minimum engine version you need is 4.21 (which I thought was 4.20).
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Thank you so much for this plugin, however I can't seem to access anything in it? I opened the YellowSubsMachine folder in-engine (Blueprints, Example Map, etc.) but only get greeted with empty folders :(
I followed the video instructions as well, but nothing new pops up.
Is there a specific way of going about it?