Tried to add a Megascan to my existing project. All worked fine, entered editor and suddenly UE froze as I assume it was working on bringing the new assets in. 30 mins go by and nothing has changed. Force closed UE and tried to open again but started getting the “fail to launch editor”. Uninstalled UE 5.4.4, reinstalled, same error. Restarted computer, same error. Installed UE 5.3.2, works fine. Can even open old projects. Problem seems to be with just UE 5.4.4.