It will surely happen to you to receive an error message while you are trying to install new apps not recognized by Apple on your Mac. There may be several error messages, but the most frequent are Unable to open the app name because it was not downloaded from the Mac App Store is Unable to open the app name because it comes from an unidentified developer. They appear when you try to install Apps that are not recognized by Apple on your Mac, which have not been downloaded from the App Store but from the internet, then from a source not recognized by Apple.
This type of control, called Gatekeeper (from Gate = Gate and Keeper = Keeper) was introduced by Apple starting from OS X version 10.7.5 to prevent Mac users from installing applications that could contain a malicious code that could steal personal information or perform other unwanted actions.
How to install apps not recognized by Apple
Although such a check is useful, the installation of reliable applications is often blocked. Fortunately there are several simple methods to solve this problem of apps not recognized by Apple and we will show you them below.
Disable Gatekeeper completely or partially
The first option to install apps that are not recognized by Apple is to completely or partially disable protection Gatekeeper.
- From the Mac go to the System Preferences (Applications -> System Preferences).
- From the System Preferences select the item Security and Privacy.
- On the new page that opens, click on the tab General and then select the padlock-shaped button at the bottom left.
- When prompted, enter the password of your Mac. This is necessary to change the operation of Gatekeeper.
- After entering the password and giving confirmation, you will have the possibility to modify the selection Allow apps from:. There are three possible alternatives: By default it is activated Mac App Store and identified developers. This option allows the installation of all the applications present on the Mac App Store plus those made by developers who have been certified by Apple. Selecting Mac App Store you will be able to install only the applications present on the Mac App Store while enabling Everywhere all restrictions will be removed and you can install all types of apps without any problems.
In general the option Mac App Store and identified developers should be sufficient to guarantee the installation of all the most popular app types, but if you receive the error messages highlighting the beginning of the article, then to solve the problem of App not recognized by Apple you will have to enable the option Everywhere. If you want to keep the security feature introduced by Apple enabled but want to install an unrecognized app but you know it is safe, then there is a further solution.
Install apps from unidentified developers and prevent them from being blocked by Gatekeeper
The safest solution to install the apps not recognized by Apple the one presented below. From System Preferences -> Security and Privacy advisable to select the item Mac App Store and identified developers. Whenever, by installing an app, you receive the error message Unable to open the app name because it comes from an unidentified developer, if you are sure that it cannot contain any malicious code, simply press and hold the key ctrl and double click on the app icon to start it.
To install apps not recognized by Apple, you may be asked to enter your Mac password to confirm the installation. In this way you will have the certainty of always having the protection of Apple active and you will decide which apps are not verified to install or not.