https://bugs.winehq.org/show_bug.cgi?id=41258
--- Comment #5 from fjfrackiewicz@gmail.com --- (In reply to plata from comment #4)
With 1.9.23 I get: LogWindows:Error: Assertion failed: Count >= 0 [File:d:\build++orion+release- 34+compile\sync\engine\source\runtime\core\public\Containers/UnrealString.h] [Line: 1151]
Do you have the full terminal output?