Hi, this is weird. There is nothing about that asset pack that have remote possibility to crash a project (just low poly meshes, a few simple materials and demo maps). There are no extra requirements to use those models as well (no plugins needed, no other software required, etc.)
Can you give me more info? Eg. Unreal Engine version, sys spec, anything specific about your project?
If you use discord, you can join my server if you want more real-time help: Vertex Rage Studio
Edit: here’s a quick video how it works in 5.6 when using Fab from engine in new project:
