Hi! I’m having the same problem as FungiDreamStudio. When I added resources from ‘Limited-Time Free’ assets, they were added partially. That is, some of them appeared in the library, and one of them didn’t.
I updated the Fab library, as you wrote, in the Unreal Engine launcher, and there I see all the added assets. But one of them is still missing from the Fab library on the website. The ‘Flying Fantasy City’ asset has not been added.
I hope this helps in some way to solve this problem.