In case anyone else runs into this problem:
I had this happen on engine 4.20.1. My project wouldn’t load and just quit at 73%. When I tried to open the engine (not my project - as if I were starting a new project) it stopped at at 72%. Engine version 4.19.2 still launched correctly. This told me the 4.20.1 engine was the problem, not my project.
My solution:
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Open the Epic launcher
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Click the down arrow next to the problem engine (in my case 4.20.1) and select ‘Remove’.
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Click the ‘+’ next to ‘Engine versions’, and reinstall 4.20.1.
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Make a cup of tea
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Hey presto, once it’s installed, everything is working again.
I’ve no idea why it broke, but removing and reinstalling the engine fixed it. Hope this helps someone else!