If you specifically need version 2.3.3 because you’re using an older Blender (2.83–2.93), contact the developer via Gumroad. Many sellers provide legacy .zip files upon request to verified buyers. Do not trust external sites claiming to host “Alpha Trees Pro 2.3.3 free download” – 99% are scams.
Once you have the add-on installed (whether paid or via a legitimate trial), here are professional tips to get the best performance and visuals: Alpha Trees Pro 2.3.3 for Blender Free Download
The add-on does not merely import static images. It provides a parametric interface to modify: If you specifically need version 2