Hi!
It depends on the license you purchase.
The “UEFN - Reference only” license only works for UEFN. Also with this license, you won’t get the demomap and won’t be able to adjust the materials.
In your case, I recommend getting the “Personal License”, which works for UE. You get the demomap and can adjust whatever you want 
Hope this helps!
If you have more questions, feel free to reach out to me here: info@tidalflask.com
Manu