Catalina: can’t be opened because Apple cannot check for malicious software
Apple’s new update for the macOS, Catalina, adds several security features to OS. One major change is the notarization of apps. Under this program, developers need to submit their apps for a verification process, before they could publish it on the macOS platform. Apps that don’t get approval from Apple are now blocked from direct execution- they display a message “can’t be opened because Apple cannot check it for malicious software.” It is beneficial for those who are concerned about the security of their Mac. But it can be annoying at times when the system blocks you from opening apps like Whatsapp, Brave Browser, Spotify, CCleaner, etc.