Extensions is installed, but not viewed in extensions/modification

Hello.
I paid extensions now: https://www.opencart.com/index.php?rout ... n_id=44723
Extension installed, but not viewed in extensions/modification
What is please problem?

Thank JAREX.

First of all: why should we know that?
Ask the developer of this extension or call the OpenCart Market Support

Second: it this extension use events only, no entries are made in the modification table.
Simply open the zip-file and check if there is a install.xml - if not, only events are used.