Taking reference to your comment:
i have the source code of a project that runs on laravel. Basicaly i am asking how can i run this source code localy on my pc
Good, that you have a project that runs on Laravel. You should probably consider to move your project to a central place, maybe Github, and from there create a proper workflow for development and further deployment to your (testing, production, ...) systems.
Even if you develop alone it would be a good practice to use git and Github - no, it is not the same
To come back to your original question:
How can i download this project and run laravel to it ? I managed to run laravel but it creates a whole new folder etc.
You don't need to install a new Laravel into an existing Laravel project. Just take the existing one.