product list does not appear after you upgrade to

Hello,
I have a big problem in my store.
Used the Starter version of Hikashop , and arrived to import a CSV with categories and products .
It worked perfectly! By clicking on the CATEGORIES menu, opened all the sub-items , and click on the sub- products were listed normally.
The last step was to upgrade to Business version of Hikashop , 2.6.1 and after updating the products are no longer listed .
All levels of categories are listed, but the products are not .
I've tried to create a new module and assign it to a menu, but still does not work !
What should I do to get back to work as before ?
Thank you very much!

Hi,

That should be working without modifications. I think that you have an override on the view "catgory / listing".
Due to this override, you don't have the latest version of that view and so the code to display the product listing.

Please do a backup of that view and remove it.