The error message that you are seeing is generated by your Mac's built-in security settings. Sometimes, these settings can be over-protective and generate false alarms when installing or running certain software. However, you can rest assured that our software is free from any malware or malicious content.
To resolve this issue, we recommend the steps below:
In the Finder on your Mac, locate the app you want to open.
Don’t use Launchpad to locate the app.
Control-click the app icon, then choose Open from the shortcut menu.
The app is saved as an exception to your security settings, and you can open it at any time by double-clicking it, just as you do with any registered app.
Note: You can also grant an exception for a blocked app by clicking the Open Anyway button in Privacy & Security settings. This button is available for about an hour after you try to open the app.
To change these settings on your Mac, choose Apple menu > System Settings, then click Privacy & Security in the sidebar. (You may need to scroll down.)
See the Apple Support article for more info: Safely open apps on your Mac.