Fix Mac "App cant be opened because Apple cannot check it for malicious software" Error, follow these steps:

To install an app that fails to be opened, open System Preferences > Security & Privacy:

Click "Open Anyway" to confirm your intent to open or install the app.

An alternative method to bypass this error is to click on the "Show in Finder" button > Go to "Applications" folder to locate the app > Control click or right click on the application file and choose "Open" option.

You will get a similar error message for malicious software checking like below. However, this time you will see an additional "Open" button.