![]() => Now, We need change security preferences to "App Store and identified developers", then it will look like this warring when open app. ![]() 'PDF Printer.app' can’t be opened because the identity of the developer cannot be confirmed. Your security preferences allow installation of only apps from the App Store and identified developers. 'PDF Printer.app' can't be opened because it is from an unidentified developer. “PDF to Word.app” can’t be opened because it was not downloaded from the App Store. When open an new app that downloaded from our website, Why the installation shows error on Mac? the error message Like this:īecause by default, From macOS 10.10 - macOS 10.14 only allows users to install applications from verified sources. In effect, most attempts to install software from the internet or physical media will show this error message: How to fix installation error on Mac: "can't be opened because it is from an unidentified developer."?
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