How to Fix "App cant be opened because Apple cannot check it for malicious software" Error?
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.

Optional Method:
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.

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