How To Fix : Missing 'Allow Apps from Anywhere' in macOS

Solutions

macOS Sequoia brings a range of security upgrades, with one key change being the removal or restriction of the "Allow Apps from Anywhere" option in Gatekeeper. This setting, once used to install apps from any source, is no longer readily available. Here's how to enable it if you need it, despite its absence in System Settings.
How to Restore 'Allow Apps from Anywhere'
If you want to enable this option in macOS Sequoia, follow these steps:
Solution 1: Use Terminal to Enable the Setting

• Open Terminal (Applications > Utilities).
• Type: sudo spctl --master-disable and press Enter.
• Enter your administrator password.
• Go to System Settings > Privacy & Security > Security & Privacy.
• The 'Allow Apps from Anywhere' option should now be visible under App Download Options.

Solution 2: Open an Unverified App Manually
If you just need to open a specific app that macOS is blocking, you can bypass the security restriction without enabling 'Allow Apps from Anywhere' entirely:

• Locate the app in Finder.
• Right-click the app and select Open.
• Click Open again in the pop-up window.
• The app will now be marked as safe, and you won’t need to repeat this process.

Solution 3: Adjust System Security Settings
Restart your Mac and boot into macOS Recovery Mode by holding Command (⌘) + R during startup.

• Go to Utilities > Terminal in the menu bar.
• Enter the command:

             csrutil disable

• Restart your Mac and try enabling 'Allow Apps from Anywhere' again.
• (Optional) If needed, you can re-enable System Integrity Protection with:

           csrutil enable

Apple restricts unverified apps for security, but users may want to restore the "Allow Apps from Anywhere" option for legitimate reasons. The methods above offer safe ways to regain control, but always ensure you trust the apps you install. For added safety, use reliable antivirus software and keep macOS updated.