You need not download anything, Kendra. It's already in your Feral Heart folder.
Just go to Feral Heart>Media>Objects>Rocks and there will be the mesh file for the rock island. c:
To put it into your game, go into the game and at the start up go to Tools and then click Object Maker.
Where it says Mesh, click it and then type in the rock island mesh which is rockIsland.mesh and for the second rock island, rockIsland2.mesh.
Go back to Object and name the objects whatever you want.
Save both objects in another group other than the default groups or else you won't be able to see them when you put the objects in a map.