Could not compile. Try rebuilding from source manually

Hello everyone.

I’m a 3D artist with no coding background. I have been looking to create stylized grass for some time now on Unreal Engine and I came across this guy named SamsonStarmerLee. He released a really good stylized grass on github :

So I downloaded the project and tried to open it on Unreal Engine 4. But alas. It wont open.
I dont know how to solve it. If someone would be kind enough to look into it, I would really be grateful.

Its a really good asset.

Thank You.