J-BusinessDirectory - Sell-offer addon

Hello.
I bought Sell-offer addon and set it according to the manual, but it doesn't work.
I asked support for help, but it didn't give me any reply and was terrified.
I really want to run sell-offer, but what should I do?

Hi Kuna

It’s important to better explain why it doesn’t work so it would be easier to track down what exactly not work for you.

Now you say something in general not explaining what doesn’t work for you?