The 5 (?) example trees you get with it is more than enough to learn the tool, you also get a bunch of textures to use if you don’t want to create your own. I’d say it’s better to learn to use the tool than use demo assets anyway so you’re better off using those examples to see how they made them and then learn to create your own.
It’s very, very straight forward and easy to use despite having hundreds of variables to tweak with. It’s amazing now and by far the best option for trees. I’ve completely dropped Forester that I think was the best option for lowpoly trees usable in unreal before. Now that so easily can create create good looking lowpoly trees, make perfect and very easy to adjust LOD levels, billboards and produce static meshes so it can be placed with the foliage tool, it’s just perfect.