In fact, if you still haven’t solved it, you can try to use the Esc+Shift+Ctrl shortcut keys to open the Task Manager. In the Task Manager window, if the progress bar is at 45%: please end all Epic engine-related content. (On my computer, many engine-related task processes suddenly appeared) After you end all Epic memory-related processes, reopen the project and you can enter it normally. I don’t know if this can help you, I succeeded with the above method. 