Mossie,
Assuming you're using Windows here - let me know if not.
To get the Arbaro GUI up and running, after you've installed the JRE, create a text file in the arbaro directory and call it "arbaro.bat". Right click the file and choose "Edit" - this should bring it up in notepad (as an empty file).
Insert the following line in the file:
Code:
java -jar arbaro_gui.jar
And save/close the file. Now double-clicking the arbaro.bat should launch the arbaro GUI.
I was disappointed in the appearance of the trees until I actually exported them as OBJ files and loaded them into AC3D --- the arbaro GUI doesn't do the final trees justice at all. You can actually see this from the screenshots at
http://arbaro.sourceforge.net/.
Good luck, and post back if you run into any problems.
Dennis