Cannot install Apps downloaded from the Apple App Store

You may encounter an issue or error message when downloading Apps from the Mac App Store.

"XXXX.app is damaged and can’t be opened.
Delete XXXX.app and download it again from the App Store."

"This application can’t be verified."

Since Mac App Store purchases and downloads are controlled completely by Apple, you may contact them directly so they can internally check if there is an issue and directly fix it.

As a workaround, here's what you can do to install these apps:

1. Delete the app via the Launchpad app.

   Click and hold the app icon, then click the “X” icon that appears.

   

2. Log out of the App Store.

   

3. Restart your Mac
4. Open the App Store. Sign in again using your Apple ID.
5. At the bottom part of the sidebar, click your account name or photo to see your purchased apps.
6. Click the Install cloud icon under the app name to reinstall.

   If you still cannot install the app. Create a new administrator user account:

   1. Go to Apple menu > System Preferences > Users & Groups.
   2. Click the lock icon. Enter your admin credentials.
   3. Click the Add button below the list of users.
   4. Click the New Account pop-up menu, then choose Administrator as the type of user.
      Follow the rest of the prompts to finish creating the new administration account.
   5. Log in using the new administrator account to install the app.
   6. Switch back to your main account. You may delete the temporary account after.

If you still have the issue you may now contact Apple’s Support Channel for further assistance.