Grass Quick Start Tutorial - No Grass - no rocks shows!

Hi forum. I was following a tutorial and noticed something isn’t quite right. First, the tutorial is published for version 5.8, but the materials used are only compatible up to version 5.2. Still, I managed to download them and include them in my new project. However, I’m not sure if the compatibility issue is causing the problem I’m facing: the grass isn’t showing up on the landscape at all. I’ve checked all the steps three times and end up with the Grass and Rock layers created, but when I paint the landscape, it reacts to the painting, yet nothing appears. Also, the tutorial introduces some concepts but doesn’t explain the features being used. Is there some one else having this problem? Any idea on where I can get a tutorial to learn this concepts? Thanks in adance!