If Yes, try Disabling FileVault and allow it to finish. If your Mac is set to allow apps from the App Store and identified developers, the first time that you launch an app from an identified developer, your Mac asks if you’re sure you want to open it.Is FileVault enabled and if so has it finished Decrypting the drive Before attempting the update to 11.5. You may want to look for a later version of the app in the App Store or look for an alternative app. If you see a warning, it means that the app has not been signed by the developer, so macOS can’t check whether the app has been modified or broken since it was released. For example, some apps were written before Developer ID registration. These messages don’t necessarily mean that something is wrong with the app. 'Example-app.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. 'Example-app.app' can't be opened because it is from an unidentified developer. If your Mac is set to allow apps from the App Store and identified developers, and you try to install an app that isn’t registered with Apple by an identified developer, you also get a warning. If you have set your Mac to allow apps only from the App Store and you try to install an app from elsewhere, your Mac will say that the app is not from the App Store. Please change "Allow apps downloaded from: " to "App Store and identified developers" If you see a warning message and can’t open an app Select App Store under the header “Allow apps downloaded from.” Click the lock and enter your password to make changes. In System Preferences, click Security & Privacy, then click General. For additional security, you can chose to allow only apps from the App Store. View the app security settings on your Macīy default, the security and privacy preferences of your Mac are set to allow apps from the App Store and identified developers. With macOS Mojave, developers can also have their app notarized by Apple-an indication that the app was uploaded to Apple and passed a security check before it was distributed.
When you install Mac apps, plug-ins, and installer packages from outside the App Store, macOS checks the Developer ID signature and notarization status to verify that the software is from an identified developer and that it has not been altered. If you download and install apps from the internet or directly from a developer, macOS continues to protect your Mac. If there’s ever a problem with an app, Apple can quickly remove it from the store.
Apple reviews each app in the App Store before it’s accepted and signs it to ensure that it hasn’t been tampered with or altered.
The safest place to get apps for your Mac is the App Store. MacOS includes a technology called Gatekeeper, that's designed to ensure that only trusted software runs on your Mac.
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