MySQLWorkbench can’t be opened because it was not downloaded from the App Store. code example

Example: “MySQLWorkbench” can’t be opened because Apple cannot check it for malicious software.

...[MySQL] will appear in System Preferences > Security & Privacy, 
under the General tab. Click Open Anyway to confirm your 
intent to open or install the app. After this, Workbench app 
is now saved as an exception to your security settings, and 
you can open it in the future by double-clicking it, just as 
you can any authorized app.

Regards,
Ashwini Patil