'Cannot be opened because the developer cannot be verified' Mac Warning

When installing applications, Mac users can sometimes encounter a message stating that the particular program 'Cannot be opened because the developer cannot be verified.' The same warning message also can be described as a macOS cannot verify pop-up. It signals that the specific application's certificate or legitimacy cannot be verified by your macOS and as such it could potentially pose a danger to the system. It is recommended to remove the application as soon as possible just to be safe. 

  1. Start by opening Activity Monitor. To do so, click on the 'Go' menu and then choose 'Utilities.' Find Activity Monitor and double-click it. The window of the application will show all currently active processes. Look for any associated with the trigger for the macOS Cannot Verify warning message, and stop them by selecting the particular process and clicking on 'Force Quit.' 
  2. The next step is to open your Applications folder. There, look for any applications with a name similar to the one mentioned in the warning pop-up. If you find any, select and move them to the Trash.
  3. Now, it is time to remove any Login Items belonging to the potentially threatening application. Select 'Accounts' followed by clicking on the 'Login Items' preference. You will be presented with a list of all items set to start automatically on every system boot. Select the ones you wish to stop and click the minus ('-') icon. 

Delete the Risky Application Manually

Users also can try to remove manually the application that causes the macOS Cannot Verify pop-up from the Library folders of the Mac. However, be careful not to remove any other files that are not related to the specific application accidentally. 

Start by selecting the 'Go' menu and then clicking on 'Go to Folder.' In the new window type /Library/LauchAgents/ and click on 'Go.' Look for any files belonging to the risky application and move them to the Trash. Afterward, do the same for the following two destinations:

~/Library/LaunchAgents

/Library/LaunchDaemons

Hopefully, this would have resolved the 'Cannot be opened because the developer cannot be verified' Mac warning.

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