BookLibary Component Support

I am using Booklibrary v3.6 Pro with Joomla 3.8.12
In the Backend when I click on Categories
I get the following error message: operator not supported for strings (see screen shot).

In the Frontend there is an error (Content coding error) with some categories but not with all.

Dear

You need update to new version.

For every old clients we give 50% discount for every new version of the product.

You must have version of component not lower 3.5 to make update.
If you have version less 3.5, update for you need do manual, or we will ask money for do it.

Before making any upgrades, make backup yours site( files and DataBase). With that you will not lost something important
Please do full XML export.
At first please check upgrade/update process at the test website!

If you have custom changes of component or site, you can lose your changes.

Please, in that case do not make update.

If you would like any further information, please do not hesitate to contact us too.


Best Wishes,
Andrew
OrdaSoft team

OK
I will upgrade to version 4.
How do I obtain the 50% discount?

Best regards,
Kees

Dear Kees

We replied to you by email.

Regards
Andrew
Ordasoft team