To use the RockMasterKit 3d models you have to click on file and then select append in Blender. After that select one of these scenes :

-Cliffs.blend

-RockFormations.blend

-RocksBig.blend

-RocksSmall.blend

-RocksMedium.blend

Then click on object and select the Models you want.

To use the RockMasterKit 3d sculpting brushes you have to click on file and then select append in Blender. After that select Brushes.blend. Then click on brushes and select ones you want.

To use the RockMasterKit 3d materials you have to click on file and then select append in Blender. After that select Materials.blend. Then click on materials and select the ones you want.