This security feature in Mac OS X is called GateKeeper, which by default blocks all the applications which are not from a verified source or from App Store. Fix “can’t be open because it is from an unidentified developer” for a particular application without altering security settings. If you want to add exception for a particular. You should now get the message saying 'App is from an unidentified developer. Are you sure you want to open it?' If you are sure and trust the source where you got that app, then simply click Open, and the app should start right away.

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Macos Mojave Open An App From An Unidentified Developer
Allow Apps From Unidentified Developers
Open File From Unidentified Developer

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.

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.

View the app security settings on your Mac

Macos Mojave Open An App From An Unidentified Developer

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.

Allow Apps From Unidentified Developers

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.*

Mac os open an app from an unidentified developer studio

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.

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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

Open File From Unidentified Developer

Mac Os Open An App From An Unidentified Developer

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

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.

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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.

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

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.

*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.

One of the security features of OS X 10.8 “Mountain Lion” is to only allow Apps from the “Mac App Store” or by an identified developer to run on your Mac. This brief tutorial will show you how to run those Apps anyway, or the disable the new “feature” entirely.

As illustrated in the screenshot below, I tried to run the App SABnzbd+ but wasn’t “allowed” to by OS X – because it was created by an unidentified developer. Not helpful.
The “quick” and safer way to run the App is to locate it in your Applications folder, right-click (ctrl+click) the App, and select Open. This will run the App regardless as to who the developer may be.
If you would like to disable this new security feature so that you’re never “warned” or “stopped” from running programs that were created by unidentified developers, open your System Preferences from the Apple Menu, and select Security

Mac Os Open An App From An Unidentified Developer