UEFN fails to launch — "Failed to open descriptor file" + ICU crash (Release 41.20)

General Issues and Bug Reporting
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hi @Wuoli19

Please run verify on your installation.

How to Verify Fortnite/UEFN

If this still fails you might have to uninstall Fortnite/UEFN and reinstall as looks like some parts did not get installed correctly in the patch update