Blender Market addons

I bought from Blender Market, excellent return policy as long as you follow procedures, followed procedures and the Blender 3D software addon not working, crashed Blender to the Desktop, the Rock creator did not work as advertised. I requested a refund from them, received a email from Ryan Berger that he refunded the amount paid, no refund until now and also no reply from him either. Will never buy anything from them again. The creator of the addon is Damian Moroski