I am using 10.12.4. I am annoyed with the current Disk Utility, so I would like to also keep a copy of the Yosemite Disk Utility. It turns out that you can bypass the Mac OS version check by changing one CPU instruction as per this guide: https://justus.berlin/2015/10/restore-old-disk-utility-in-os-x-el-capitan However, this does not work in Sierra. Is there a way to do this? I tried this using Disk Utility from 10.10.5 (matching the checksum), however on Sierra 10.12.4 it produces the same error message. I reopened the file to confirm that the byte was indeed changed.