Check tutorial of How to Allow Apps from Anywhere in macOS Gatekeeper (Catalina, Mojave, Sierra, High Sierra)

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Advanced Mac users may wish to allow a third option, which is the ability to open and allow apps downloaded from anywhere in MacOS Catalina, macOS Sierra, macOS High Sierra, and MacOS Mojave. To be clear, the “Allow applications downloaded from anywhere” option is hidden by default in Gatekeeper for macOS from Sierra onward. Sep 27, 2016 Advanced Mac users may wish to allow a third option, which is the ability to open and allow apps downloaded from anywhere in MacOS Catalina, macOS Sierra, macOS High Sierra, and MacOS Mojave. To be clear, the “Allow applications downloaded from anywhere” option is hidden by default in Gatekeeper for macOS from Sierra onward.

Gatekeeper in macOS is now stricter than ever and by default only allows options for apps downloaded from the App Store or the App Store and for identified developers. Advanced Mac users may want to allow a third option, which is the ability to open and allow apps downloaded from anywhere in macOS Catalina, macOS Sierra, macOS High Sierra, and macOS Mojave.

To be clear, the ‘Download applications from anywhere’ option is hidden by default in Gatekeeper for macOS from Sierra. You can see this by going to the Security & Privacy preference pane and under the “General” section you will not find such an option for settings for allowing the Gatekeeper app. Nevertheless, with a small intervention via the command line, you can reveal the third option and regain the ability to open apps from anywhere.

This is not recommended for most Mac users, only advanced Mac users and developers who are able to accurately measure app validity should use this method which involves disabling Gatekeeper from the command line, making the default Gatekeeper security mechanisms in Mac OS will be removed.

How to Allow apps from anywhere in Gatekeeper for macOS Catalina, macOS Mojave, macOS Sierra

Mac Allow Apps From Anywhere

1. Exit System Preferences
2. Open the Terminal app from the / Applications / Utilities / folder and then enter the following command syntax:

sudo spctl –master-disable

3. Hit return and authenticate with an administrator password
4. Restart System Preferences and go to “Security & Privacy” and the “General” tab
5. You will now see the “Anywhere” option under “Allow apps to download from:” Gatekeeper options

You can now open and run apps from anywhere under macOS Mojave, High Sierra, and Sierra, but be warned, this disables Gatekeeper and is not recommended for the vast majority of Mac users.

Allowing apps from anywhere, including unidentified developers, can potentially leave a Mac vulnerable to certain malware and junkware and should be avoided by all Mac users except those with really advanced capabilities.

Another approach is to manually add Gatekeeper exceptions via the command line, a solution that may be more suitable than simply running everything past Gatekeeper.

Revert to basic Gatekeeper security in macOS Mojave, High Sierra, Sierra

You can also undo this and go back to the default strict Gatekeeper settings to allow only apps from the Mac App Store and identified developers by entering the following command string:

sudo spctl – master-enable

Pressing return and reauthenticating will revert macOS Gatekeeper to its strict default state of not allowing arbitrary apps to start.

Almost every Mac user should leave this feature enabled in the default state. If you cannot easily distinguish which apps are legitimate or not, then you absolutely should not change this option. The message “app cannot be opened because it is from unknown developer” is intended to provide protection for the vast majority of Mac users and should not be ignored.

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Allow Apps Downloaded From Anywhere

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To get the latest features and maintain the security, stability, compatibility, and performance of your Mac, it's important to keep your software up to date. Apple recommends that you always use the latest macOS that is compatible with your Mac.

Learn how to upgrade to macOS Big Sur, the latest version of macOS.

Check compatibility

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If you want to check compatibility before downloading the installer, learn about the minimum requirements for macOS Catalina, Mojave, High Sierra, Sierra, El Capitan, or Yosemite. You can also check compatible operating systems on the product-ID page for MacBook Pro, MacBook Air, MacBook, iMac, Mac mini, or Mac Pro.

Make a backup

Before installing, it’s a good idea to back up your Mac. Time Machine makes it simple, and other backup methods are also available. Learn how to back up your Mac.

Download macOS

It takes time to download and install macOS, so make sure that you're plugged into AC power and have a reliable internet connection.

These installers from the App Store open automatically after you download them:

• macOS Catalina 10.15 can upgrade Mojave, High Sierra, Sierra, El Capitan, Yosemite, Mavericks
• macOS Mojave 10.14 can upgrade High Sierra, Sierra, El Capitan, Yosemite, Mavericks, Mountain Lion
• macOS High Sierra 10.13 can upgrade Sierra, El Capitan, Yosemite, Mavericks, Mountain Lion, Lion

Your web browser downloads the following older installers as a disk image named InstallOS.dmg or InstallMacOSX.dmg. Open the disk image, then open the .pkg installer inside the disk image. It installs an app named Install [Version Name]. Open that app from your Applications folder to begin installing the operating system.

• macOS Sierra 10.12 can upgrade El Capitan, Yosemite, Mavericks, Mountain Lion, or Lion
• OS X El Capitan 10.11 can upgrade Yosemite, Mavericks, Mountain Lion, Lion, or Snow Leopard
• OS X Yosemite 10.10can upgrade Mavericks, Mountain Lion, Lion, or Snow Leopard

Install macOS

Follow the onscreen instructions in the installer. It might be easiest to begin installation in the evening so that it can complete overnight, if needed.

If the installer asks for permission to install a helper tool, enter the administrator name and password that you use to log in to your Mac, then click Add Helper.

Please allow installation to complete without putting your Mac to sleep or closing its lid. Your Mac might restart, show a progress bar, or show a blank screen several times as it installs both macOS and related updates to your Mac firmware.

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You might also be able to use use macOS Recovery to reinstall the macOS you're using now, upgrade to the latest compatible macOS, or install the macOS that came with your Mac.