After you download the app and move it to your Applications folder, launch it.The long way to open an unidentified, downloaded app in the Sierra beta Sierra adds the developer to its internal list of identified developers so you can open other apps from the same developer. After you select Open, you will see a warning that’s similar to the one below.After you download the app and move it to your Applications folder, right-click on it and select Open.The quick way to open an unidentified, downloaded app in the Sierra beta If you want to open an app that you didn’t buy in the Mac App Store and instead downloaded it from a developer on the internet, there are two way for opening the app. The General tab of the Security & Privacy system preference. If you had this setting selected in El Capitan and you’ve upgraded to the Sierra beta, you won’t be able to open downloaded apps like you’re used to. The major change is that Apple removed the Anywhere setting. The change in the macOS Sierra Public Beta Anywhere: You’ll see a notification that says the new app you want to open was downloaded from the internet, and you need to confirm that you want to open it.To open the app, you have to go to System Preferences > Security & Privacy, and click the Open Anyway button that appears in the General tab. Mac App Store and identified developers: When you try to open a new app and it’s not on the list of identified developers that’s saved within the operating system, the Mac tells you it can’t open it.Mac App Store: The Mac will only run apps downloaded from the Mac App Store.“Allow apps downloaded from” has three settings: In El Capitan, you have the option to allow apps that you downloaded from the internet, without any intervention from the operating system.

How to download an app from apple