Download a DMG file, copying it into /Applications/, right clicking on it and selecting Open now causes following error:
"ClearMyMac 3.app" is damaged and can't be opened. You should move it to the Trash.
- Go to termin iTerm
- cd /Applications/Utilities/Terminal.app:
- /Applications/Utilities/Terminal.app$: sudo xattr -r -d com.apple.quarantine /Applications/CleanMyMac\ 3.app/
- Open ClearMyMac 3.app again. Enjoin!