- May 15, 2016
- GIGABYTE Z170M D3H
- RX 480
Go to top tool bar and right click the apple, drag down to force quit. Look for install HS. If you opened it or it opened after download and you only hit the red close tab it may still be open. You can also do this in Disk Utility by unmounting it. Yes an installer will appear as a disk or drive when it in an open status.I found a few other posts with this issue and they they didn't get any resolution either.
I understand that "the destination disk cannot have the same name as any other mounted disk."
Does the macOS download in my applications folder count as a "mounted disk"?
If not then I don't understand the error I'm getting as there shouldn't be another disk with that name besides when Unibeast changes my flash drive name to "Install macOS High Sierra".