![]() Diagnosis: Modern macOS, like Mojave and Catalina, includes a technology called Gatekeeper, which is built to help you safely open apps on your Mac.įor sure Apple App Store is the best place to get software applications, but in many cases, you'll need to download and install apps out of the store. When I go to open the package it tell me: "Skype can't be opened because Apple cannot check it for malicious software. Check this complete macOS Catalina Problem troubleshooting article. Summary: Trying to install an app on macOS Catalina but get an error message saying XXX can't be opened because Apple cannot check it for malicious software.
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