The crashes seem to be caused by redirector issues, similar to here: https://answers.unrealengine.com/que…ame-index.html
The fix is essentially number 4 in the highlighted answer. Some of the files in …/CharacterCustomizer/Apparel/ that were renamed for v4 have broken references and you’ll have to figure out which of the folders in /Apparel/etc are causing the crashes.
I don’t think there’s any point submitting a hotfixed project because the problem is in the engine files and not the project files, but I’m not entirely sure.