Delete your install application, then download it again from the App Store." DiskMakerX - " Sorry, your OS X Install app or DMG may be incomplete.It probably couldn't be unmounted to erase it." Try ejecting the destination disk and reinserting it, or rebooting. Install Disk Creator - " An error occurred.I additionally tested the issue by using Install Disk Creator (v1.3 (1) v 1.4 (3) ) and DiskMakerX (v6rc5): 2012 MacBook Pro running OS X El Capitan 10.11.6 - Result: ' is not a valid volume mount point.'.2011 iMac running OS X Yosemite 10.10.5 - Result: ' is not a valid volume mount point.'.2017 MacBook Pro running macOS High Sierra 10.13.6 - Result: ' is not a valid volume mount point.'.Many have referred to this as 'planned obsolescence', and after seeing the direction that Apple has been going with things lately I have to agree. It would appear that Apple has effectively declared war on its users who want or need to use an older OS version than the current version. I, too have the same problem with the macOS Sierra installer.
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