Select “Apple Software Update Certificate Authority,” as pictured. If neither icon is present, the package is unsigned, and you shouldn't install it. If you have a package (.pkg) installer, you can confirm that it is authentic and complete by verifying its digital signature before installation.Ĭlick the lock icon or certificate icon in the upper-right corner of the installer window to see information about the certificate. When you use Software Update to download and install software, Apple's digital signature is automatically verified before installation. Always get Apple software from one of these sources, and always check these sources to make sure that you have the latest software. You can verify the digital signature of software downloaded from Apple to confirm that the software authentic and complete.Īpple digitally signs all software updates to ensure their authenticity, and offers them exclusively through Software Update, the App Store, or Apple's Downloads site. How to verify the authenticity of manually downloaded Apple software updates
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