Some Blender tutors provide the add-on temporarily as part of a landscape course. Check YouTube tutorials from creators like Ryuu or CG Matter —sometimes they include a download link for the legacy version (2.3.3) for educational use.
Searching for "Alpha Trees Pro 2.3.3 for Blender free download" is tempting, but the security risks and lack of updates make it a dangerous gamble. Instead, add the official Blender Market page to your wishlist and wait for a sale. In the meantime, use the free workflow tips above to master alpha-card vegetation. Alpha Trees Pro 2.3.3 for Blender Free Download
: In the add-on settings within Preferences, click the folder icon to select the path where you extracted the tree library. Some Blender tutors provide the add-on temporarily as