I’m also curious about this solution. This is necessary because there is no way to import assets purchased from the marketplace into my project. The engine built with the source code is not registered in the Epic Launcher, and the project is also not registered in the Epic Launcher. I bought an asset from the marketplace, but I can’t include it in my project.
I can do it if I download another engine from the Epic launcher, create a project with that engine, download assets in the project, export the assets, and then import them into my project. but this is a very cumbersome way.