The macOS OS X El Capitan 10.11 dmg file cannot be opened.
https://support.apple.com/en-us/HT211683
There may be something wrong with the file.
Mac Pro, OS X 10.11
https://support.apple.com/en-us/HT211683
There may be something wrong with the file.
Mac Pro, OS X 10.11
Check in download folder and if the DMG is there, drag and drop to Trash and empty Trash, Download again.
Check in download folder and if the DMG is there, drag and drop to Trash and empty Trash, Download again.
I think the file _MASReceipt is missing. It should be in /Contents
The macOS OS X El Capitan 10.11 dmg file cannot be opened.