Sadly i have not done this by now. If ticking “maps only” (like a user said a few posts above this) doesn’t help, then it MIGHT be broken right now (don’t quote me on that).
I normally make sure that my project has no other things in it when packaging it ):
Please, even if you don’t want to hear that, keep in mind that your project will grow by time. That means, even if you strip down the project
now and remove unnecessary files, you will come to a point where the project will be too big to be packaged as fast as you want.
You really need to consider upgrading your PC. I know it’s expensive, but hobbies and jobs need spending money from time to time 
I also want to note here: I already told Epic about your thread. Make sure to be patient and wait for an official reply that might help you with
the packaging process!