I want to deploy my program on Macintosh and I have a working installer but the installer and the files are packed into a zip file. I would like to make a DMG file and place them into it. This is easy to do but I would like the installer to start automatically when the user opens the DMG file. Is there any way to do that?
No, you cannot do this. What you need to do is convert your installer package to a flat package (these are now the default anyway). A flat package installer is a single file, so there's no need to bundle it into a zip or DMG.