How to add package to laravel without composer?

Question

Composer

how to add this package to my laravel project without installing via composer?
because I downloaded this package in a zip archive, and I need to include it in my project (I need to do it this way because I will make some changes to their code) I want to put this code in app/Http/Utilities
, but I can’t see it in my namespas the necessary classes how to add it to the project?