After a couple of weeks trying to set up this extension, I finally contacted landofcoder a week ago about an issue displaying prices. They haven't contacted me at all. I believe that if I pay for something at least I own the right of receiving information when I need it. The level of support is extremely poor. Even in the description page, the link documentation goes to a Hika module, instead of Joomshopping extension support page.
I will not use it in my website and I don't recommended it.