Hello I am new to ZENPHOTO I think it might be what I am looking for as a website ,
My Question is can I issue a client to be able to access and download images files directly from my gallery

I can see a client page , which asks for "Enter your access" code:
Nige 50

Depends on what you mean. But I think you are talking about site passwords that prevent direct access to your folder of original images. If so that is outside the scope of Zenphoto and will have to be addressed by your ISP.

If you are talking Zenphoto user credentials (which have no direct relation to downloading images) then you should review the user guide topic on user rights.

If you mean a real separate client area that will be some work...