Downloading The Same Verison Of Mac OS From A Mac As Is Installed

I have an actual Mac Pro I'm trying to install El Capitan on. I NEED to be able to download El Capitan FROM El Capitan in an .app or .dmg format to be able to do what I need to do, and can't really explain further than that. I CANNOT use any other version for this except maybe if you can provide a way to download Yosemite from El Capitan, and there is NO alternative to downloading from this other computer with El Capitan installed, which MUST stay on El Capitan and DOES NOT have any installers on it currently. This may not be the right place to ask, but I have been struggling for 9 hours, please help me, I'm at the end of my wits. I CANNOT download a recovery version of the OS on the Mac Pro for reasons I won't get into.

submitted by /u/bleachisprettygood
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