I have a license of it and it runs fine under Win7.

The tool ist not bad, it can create trees in different resolutions and can create flat images of the tree for billboards.

I personally did not like the results very much. The textures that come with that tool are very bad and too lowres. The geometry is also very simple. You can only select a few additional models for the roots and they all look artificial.

So my resume was that it is good for prototyping to create some trees very fast. But it is not the best solution for a final result.