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Create a small partition and install Yosemite or another older version of OS X. Boot into your new volume to run the old Disk Utility.
I'd make a full backup before testing it the first time; and give the App a thorough workout.
I doubt it, but something might go wrong.
 
I don't understand how the new one is any harder to use than the old one. If anything it's easier to use and makes it that John Q user can partition his drive without having to really understand all sorts of tech.
 
I don't understand how the new one is any harder to use than the old one. If anything it's easier to use and makes it that John Q user can partition his drive without having to really understand all sorts of tech.

I agree. I accept that Disk Utility has some bugs at the moment, but overall I like the redesign and find it much clearer.
 
It does not work. I tried to run it from a Yosemite partition and even overwrote the new one with it in El Capitan Utilities. Always got a message that it's the wrong OS.
 
I would imagine that the Disk Utility has always been hardwired to only run in the proper OS that it was assigned to, even way back to 10.0.x in 2001.

Reason being that the DU always had a special version used in the installer CD/DVD and recovery partition environment, so DU has always been version-dependent.
 
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