To be clear, for the expansion pack to work, you must also have the “main” forester plugin installed.
Main Forester plugin:
I think this is a great plugin, but comes with a bit of a learning curve.
Once you load a tree from the tree library you get 2 very basic c4d materials for trunk and leaves (only texture in color channel). While this might work, I would spend the time to setup better corona mats and save the entire tree in the content / asset browser for future use.
Randomize button gives you quick, endless tree variations.
The trees in the expansion pack give you more complex (better) corona mats.
I use the forester multi cloner for everything “scatter”. Works really well, even with non-forester assets and of course Corona mats.
If you do animations, the hyper wind is a great feature.
Definitely watch the tutorials on the site.
If you need to “shape” your trees, flowers, etc (height, density, variations, etc) or need to go low poly to fill a large scene, Forester gives you the most flexibility.
If you just want to put great looking assets in a scene and render, I agree with beanzvision, try Maxtree. Materials are setup for corona and good to go.