Hello!

So the terrain is not part of the additional assets (as you can see in the desc of the product you got the extra 3D models and UI sets) but:

• I discuss how I made it in episode #33 (https://mina-pecheux.medium.com/making-a-rts-game-33-using-unitys-terrain-tools-unity-c-2ed360459536)
• you can take a look at the Github repo to see how it’s made (https://github.com/MinaPecheux/UnityTutorials-RTS)

I hope it helps!

Cheers :)