How to clone XD Category Groups module for opencart?

Question

opencart

There was a need to clone the module for OpenCart.
Like everywhere renamed files and classes. But for some reason it doesn't work correctly. When I change in the second module, everything automatically disappears in the first.
Tell me how to clone correctly. Google didn't turn up anything useful.
I will be ok. thanks for the help.
Link to the module.

Answer 1

Copied the module. The error was in the register.