While installing third-party applications on Mac, you may have seen Gatekeeper, which protects and blocks malware from entering your Mac device during the installation setup. However, sometimes during this, you may be stuck on the Verifying window because of the CoreServicesUIAgent, a Built-in GUI agent responsible for verifying third-party app installers or disk images on Mac to avoid any security threats.

It’s a normal process, but sometimes it gets stuck, which is rare due to extended CPU usage. Where GateKeeper CoreServicesUIAgent stopped working due to extensive usage of mac resources. Today in this article, we will share the possible troubleshooting you can use to resolve the “CoreServicesUIAgent is verifying the app” alert.

Fix: Verifying CoreServicesUIAgent Window on Mac

Fix CoreServicesUIAgent verifying

Before proceeding, you might be curious about what CoreServicesUIAgent is on Mac. This is a GUI (Graphical User Interface) agent, a Gatekeeper, where it verifies all the third-party installations to maintain the security of your Mac and prevent your machine from unwanted virtues and hazardous files.

Follow the following troubleshooting one by one to resolve; here is how you can end.

Force Quit the App

This is the first thing you can do when closing the App if it’s not showing the close window option or it sucks. From Activity Monitor, you can simply force close the App and restart your Mac to clean the temp files.

  • Press and Hold Option + Command + Escape Key to force quit the App
  • Alternative: Go to Application, and choose Utilities; from there, launch the Activity Monitor.
  • Use the search function, and Check for the “CoreServiceUIAgent.”
  • Choose the CoreServiceUIAgent, and then click on the (X) button on top to quit.
  • Next, it will ask for confirmation. Confirm your selection to exit the CoreServiceUIAgent successfully.
  • That’s it!

Ensure you have closed both App and the CoreServicesUIAgent. And then restart your Mac to clear the temp files from your computer. Having attempted to install using the same DMG or package and encountering the same problem, you ended the process. Therefore, we suggest you download a new package version to ensure you have not downloaded corrupted files.

Restart your Mac

If you don’t want to re-download the package or verify the files correctly, you should give it another shot by restarting your Mac.

  • Click on the Apple logo on the screen’s upper-right corner.
  • Next, Choose the Restart option, and click on the Restart option from the drop-down context menu.
  • That’s it!

To do this, you must refresh your Mac machine’s active memory. Even if this doesn’t solve the issue, you should consider updating your Mac. In case Gatekeeper Whenever Gatekeeper Software is updated with a new patch to support your installations isn’t recognized, it is later acknowledged by Apple and updated.

Update your Mac to the latest version

Before updating, ensure you have a backup of your Mac. To Backup, simply connect your drive to your Mac and then Open Time Machine from the System preference (Click on the Apple Icon and then System preferences). Choose the Time machine, and then Choose the Backup Disk; click on Use Disk, and then the Time machine will appear in the menu. Click on it and then select Backup now.

  • Click on the Apple logo from the top-left corner of the screen.
  • Choose System Preferences from the context menu.
  • There you will find the Software update; else, you can use the search functionality to search for Software updates.
  • If it says, Your Mac is up to date, you don’t have any new updates. If an update is available, click Upgrade Now to update your Mac to the latest version.

Depending on your resources, it takes some time to download and finish updates. Keep patience during this process. Also, updating your macOS to the latest version brings several benefits, which include security updates and features.

Right-Click on the App and Open it.

To bypass the Gatekeeper, you can check if the App runs normally on your Mac. If the App is running properly, you can uninstall the problematic App and install the package on your Mac.

  • Right-click on the App, and then choose Open.
  • Next, Mac still shows the verification progress bar, but it also shows the Open Button.
  • Click on Open, and next, If the App opens normally, then any other app might create a conflict with the App to open.
  • That’s it!

Once you figure out the apps creating conflict, you should uninstall that App and restart your Mac to resolve the issue.

Allow apps from anywhere.

So, if your App can’t identify the app developer, then Mac will automatically block it, so if you still want to install it on your Mac, then you can unblock the App and allow your Mac to proceed with the installation of the App.

  • Open Terminal, and type spctl –master-disable.
  • Hit enter and enter your password to continue.
  • After that, go to System preferences.
  • Choose Security & Privacy and click on the lock icon to open the settings.
  • From there, go to Allow apps to be downloaded from.
  • Now, select Anywhere, and Lock the change.
  • That’s it!

Now try opening the App again. By doing this, you are compromising security, which means you are doing this at your own risk.

Set up App from Installer on Mac

  • Open Finder and click on Go from the top menu.
  • Click on the Go to folder.
  • Enter /System/Library/CoreServices/Installer and hit enter.
  • After that, double-click on the package you want to install on your computer.

Not to mention, this is an essential feature to have on your Mac. If you are still encountering the issue after doing all the possible troubleshooting, then check the package with the Free Malwarebyte anti-malware tool or Free EtreChecktool. If you find any suspicious files, report them to the developers and ask them to patch them. Or use the older version of the package if it supports it.