If you are trying to launch an application, which is not installed from App Store and the developer of the application is unidentified, then you may get an alert saying “[App name] can’t be opened because it is from an unidentified developer”. 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 application without changing GateKeeper’s security settings, follow the steps below.
Mac App Store: The Mac will only run apps downloaded from the Mac App Store. Mac App Store and identified developers: When you try to open a new app and it’s not on the list of identified. Some Mac users say that they can't download programs from other website except Mac App Store, or they may can't be opened the download file. When they click on the download file, it says 'xxx can't be opened because it is from an unidentified developer'.For example. When you receive a message that indicates you are prevented from opening an app from an unidentified developer, to open from Safari you can: (1) click on the download icon (the down arrow in the top right corner of Safari. (2) right click on the file to open; (3) select 'Show in Finder'; (4) in Finder, right click on the file; (5) select 'open'. Tutorial on how you can change your mac os sierra settings to allow you to open apps from all developers. If you are watching this you have likely ran into 'App can’t be opened because it is.
How to Open Applications Using Terminal on Mac. Apple's Terminal provides you with a UNIX command line inside the OS X environment. You can enter the open command here to open any application, or to open a file with the application of your.
1. Here we have tried to launch “Open Office” and we got below error.
“OpenOffice” can’t be opened because it is from an unidentified developer
2. To fix this, navigate to System Preferences > Security & Privacy.
3. There you can see below message “OpenOffice” was blocked from opening because it is not from an identified developer. Click on “Open Anyway” button, followed by “Open” in pop up. That’s it.
Now on you will able to launch this particular application (Here it’s OpenOffice) without any issue. Mac OS X will remember this exception for this particular application. But as default security settings of GateKeeper has not been altered, you will have to perform the same steps again if you get this issue for another application with unidentified developer.
You can also do the same by control-clicking (right click) on the particular application logo and then select “Open” option followed by again “Open” option to launch it anyway.
Permanent fix for all applications from unidentified developer
Mac Open Unknown Apps
For doing this you have to alter security settings in your Mac OS X, which is not a good idea as it will make your Mac less secure. Instead of doing this it’s alway recommended to allow individual applications as stated above. For permanent fix for all applications from unidentified developer follow the steps below:
1. Go to System Preferences > Security & Privacy. Click the lock to make changes and enter your account password to verify.
Mac Open Unknown App Windows 10
2. Now set the radio button to Anywhere followed by Allow from Anywhere. This settings will be reset automatically if you don’t use this feature for 30 days.