How to fix damaged app message on macOS Sierra

Panayiotis Georgiou
Jan 5, 2018 · 2 min read
Image for post
Image for post

Updated to macOS Sierra? Can’t run an app download from the internet? Learn how to solve ‘This App Is Damaged’ error in macOS Sierra with this quick tutorial How to fix damaged app message on macOS Sierra.

So far after updating my macOS everything went smoothly and I have been loving it so far. Apple has tightened up the Gatekeeper security in its latest operating system and one very visible change is that the option to allow apps from unidentified developers is no longer there.

“This tight security causes some apps to throw ‘this app is damaged’ error.”

Image for post
Image for post

Previously, you could simply change a setting and allow any app to run on your Mac. With macOS Sierra, Apple has removed that option from Settings.

How to fix damaged app message on macOS Sierra

For that reason you might have to completely disable Gatekeeper checks, and to do that open your terminal and type:

sudo spctl --master-disable

**Enter your password and you’re done. Note that there are two (2) dashes before master. You might miss that while copy/pasting. So I will leave a screenshot below. I would suggest you type the command manually.

To verify that your operation was successful you need to Open Settings and verify that the Anywhere option is now visible as shown below.

Image for post
Image for post

Revert the Gatekeeper Settings

sudo spctl --master-enable

If you liked this article, then please subscribe to our YouTube Channel for video tutorials.

You can also find us on Twitter and Facebook.

Originally published at Panayiotis Georgiou.

Welcome to a place where words matter. On Medium, smart voices and original ideas take center stage - with no ads in sight. Watch
Follow all the topics you care about, and we’ll deliver the best stories for you to your homepage and inbox. Explore
Get unlimited access to the best stories on Medium — and support writers while you’re at it. Just $5/month. Upgrade

Get the Medium app

A button that says 'Download on the App Store', and if clicked it will lead you to the iOS App store
A button that says 'Get it on, Google Play', and if clicked it will lead you to the Google Play store