If you can’t open an app on Mac

You may not have the privileges to open the app, the app may be damaged, or it may not be installed.

If you aren’t an administrator of your Mac, the administrator may be preventing you from using the app. Contact the administrator of your Mac.
You may be trying to open an app that is not registered with Apple by an identified developer. If you want, you can open an app from an unidentified developer.
If you recently installed a new version of macOS, some apps may need to be updated or reinstalled. See Install and uninstall apps from the internet or disc.

Helpful?

macOS User Guide