The safest place to get apps for your Mac is the App 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. If there’s ever a problem with an app, Apple can quickly remove it from the store.

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Now you only have the choices to either allow applications from the Application Store, or from the Application Store and Identified Developers. In any case, there is as yet an approach to dispatch third party applications from unidentified engineers on your Mac running macOS Sierra. Opening Unidentified Apps in macOS Sierra. MAC: 报错unidentified developer, 如何在macOS Gatekeeper中随处允许应用程序（Mojave，Sierra，High Sierra）,open an app from an unidentified developer, How to Allow Apps from Anywhere in macOS Gatekeeper (Mojave, Sierra, High Sierra) 重新启动系统偏好设置并转到“安全和隐私”和“常规”选项卡. A pop-up box will be shown with a warning asking if you are sure to open the app. Click on “Open” to confirm that you want to open it. In this article, we have talked extensively on macOS Catalina and the problem with “open apps from unidentified developers on Mac”, we have explained what gatekeeper is and how it can be disabled. And the default settings is to only install and run apps from the App Store and from identified developers. If you try to double click, your mac will just tell you that your mac has been configured to only open apps from app store and identified developers. Method 1: Case by case This is the method I recommend if you have to run unidentified apps. Alternatively, to override your security settings and open the app anyway: In the Finder, locate the app you want to open. (Don’t use Launchpad to do this. Launchpad doesn’t allow you to access the shortcut menu.) Press the Control key, then click the app icon. Choose Open from the shortcut menu.

If you download and install apps from the internet or directly from a developer, macOS continues to protect your Mac. When you install Mac apps, plug-ins, and installer packages from outside the App Store, macOS checks the Developer ID signature to verify that the software is from an identified developer and that it has not been altered. By default, macOS Catalina also requires software to be notarized, so you can be confident that the software you run on your Mac doesn't contain known malware. Before opening downloaded software for the first time, macOS requests your approval to make sure you aren’t misled into running software you didn’t expect.

Running software that hasn’t been signed and notarized may expose your computer and personal information to malware that can harm your Mac or compromise your privacy.

Unidentified Developer On Mac

View the app security settings on your Mac

By default, the security and privacy preferences of your Mac are set to allow apps from the App Store and identified developers. For additional security, you can chose to allow only apps from the App Store.

In System Preferences, click Security & Privacy, then click General. Click the lock and enter your password to make changes. Select App Store under the header “Allow apps downloaded from.”

Open a developer-signed or notarized app

If your Mac is set to allow apps from the App Store and identified developers, the first time that you launch a new app, your Mac asks if you’re sure you want to open it.

An app that has been notarized by Apple indicates that Apple checked it for malicious software and none was detected:

Prior to macOS Catalina, opening an app that hasn't been notarized shows a yellow warning icon and asks if you're sure you want to open it:

If you see a warning message and can’t install an app

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 can't be opened because it was not downloaded from the App Store.* How to make mac apps pop up from bottom.

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 signed by an identified developer or—in macOS Catalina—notarized by Apple, you also see a warning that the app cannot be opened.

If you see this warning, it means that the app was not notarized, and Apple could not scan the app for known malicious software.

You may want to look for an updated version of the app in the App Store or look for an alternative app.

If macOS detects a malicious app

If macOS detects that an app has malicious content, it will notify you when you try to open it and ask you to move it to the Trash.

How to open an app that hasn’t been notarized or is from an unidentified developer

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Running software that hasn’t been signed and notarized may expose your computer and personal information to malware that can harm your Mac or compromise your privacy. If you’re certain that an app you want to install is from a trustworthy source and hasn’t been tampered with, you can temporarily override your Mac security settings to open it.

In macOS Catalina and macOS Mojave, when an app fails to install because it hasn’t been notarized or is from an unidentified developer, it will appear in System Preferences > Security & Privacy, under the General tab. Click Open Anyway to confirm your intent to open or install the app.

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The warning prompt reappears, and you can click Open.*

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The app is now saved as an exception to your security settings, and you can open it in the future by double-clicking it, just as you can any authorized app.

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*If you're prompted to open Finder: control-click the app in Finder, choose Open from the menu, and then click Open in the dialog that appears. Enter your admin name and password to open the app.