1. Can't Open Mail On Mac
  2. Can't Open Apps
  3. Mac App Store Won't Open
  4. Cannot Open App On Macbook Pro
  5. Can't Open Outlook On Mac
  6. How To Open App On Mac

Apple is obsessed with privacy and security which is a good thing for us, the end-users. By default, macOS allows you to only run apps and software that are downloaded from the Mac App Store or identified developers. But if you want to open an app from an unidentified developer in macOS, then here are two ways to do so.

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. Drag apps to the Trash to delete them. Close down any version of the app if it is currently running on your Mac by using the Quit App button in the menu bar. Then open Finder and go to the Applications folder, find the relevant app and drag it to the Trash. You should check the Application folders for individual users on your Mac. Solution 1: Make sure you have dragged the app to /Applications to complete the installation. Access /Applications in Finder and find the app, right click the app icon, choose Open menu item in pop-up right menu. Then click “Open” button in the pop-up window. Solution 2: Contact with the developer to update and notarize the app.

  1. I have tried to follow these steps many times, but its not really working for me. I have a MAC so I thought I would get the same notification, but I'm not. Its not the same as you. Every time I try and open Origin it says I can't because 'Someone else is using it' then it is followed by 'Ask the other user to quit the application, and then try.
  2. (If you click the icon of an app that isn't currently running, it will open.) You can shut down an app directly from the dock by right- (or Ctrl-) clicking the icon and selecting Quit.

However, before we begin, a word of caution! It is a common and prevalent practice to insert harmful code and malware into apps and distribute/redistribute them. So, it is quite possible that a shady app that you torrented or got from an unverified developer might be infected and dangerous. If you understand the consequences and still want to proceed, here is how to override your security settings and open an app anyway from the unidentified developer in macOS.

How to Allow and Open App from Unidentified Developer in macOS

Step #1. Launch Finder on your Mac and locate the app you want to open. You are most likely to find this app in Downloads, Desktop or Applications folder.

Note: Do not use Launchpad as Launchpad does not allow a shortcut menu on apps.

Step #2.Control-click (hold the Control button and click) on the app icon.

Step #3. Now click on Open from the above list. Confirm if asked again to whether open the app or not.

You will see that the unidentified app has opened. From now onwards, this app is saved as an exception to your security settings. Anytime in the future, you can open it by double-clicking just like you open other known and registered apps. As mentioned in the previous line, this does not change the whole relevant security settings of your Mac but merely creates an exception for this particular app. Everything else is just as secure as it was.

Additional Method: If you don’t follow the above steps and simply double click an unidentified app and it does not open and shows a popup similar to the one below.

Go to System PreferencesSecurity and Privacy and click on the Open Anyway option. Enter your Mac’s password if asked.

The above methods were relatively secure, easy, and swift to open an unidentified app. It hardly took a few clicks. However, if you would like to change the security settings of your Mac (as far as app launching is concerned), then you will have to disable Gatekeeper and turn on Allow apps downloaded from to: Anywhere.

How to Allow All Unknown Apps to Open on Mac Running macOS Catalina

Step#1. Open Terminal on your Mac by going into LaunchpadOther. Or you may press together Command(⌘) + Space Bar to open Spotlight Search, type Terminal and hit enter.

Step #2. Make sure System Preferences is not open. If it is, close it. In the Terminal type the following command and hit enter.

sudo spctl ––master-disable

Step #3. Enter your Mac’s password and hit enter. Note that when you type the password it won’t be visible. You may close Terminal now.

Step #4. Launch System Preferences from your Dock or by clicking on Apple Logo – System Preferences. Now click on Security and Privacy.

Step #5. Under the General tab, you might see that under ‘Allow apps downloaded from’, ‘Anywhere’ is chosen. If not, then from the bottom left, click on the closed padlock icon and enter your Mac’s Password.

Step #6. From under Allow apps downloaded from: choose Anywhere. Click on Allow From Anywhere to confirm. Click on the open padlock to prevent further changes as our motive has been achieved.

Can't Open Mail On Mac

From now onwards your Mac will open all apps irrespective of whether it is downloaded from App Store, App Store and identified developers or any random developer. Please know that this is dangerous for the security and safety of your Mac and your private data. So only do this if you know what you are into. For most ordinary people, it is advised that you do not go this route. Use the first method instead.

To turn Gatekeeper back on and return everything to the default state:

Open Terminal and type the following command and hit the enter key. Input your Mac’s password to confirm.

sudo spctl –master-enable

Are All Apps from Unidentified Developers Dangerous?

Can't Open Apps

No. This is not necessarily the case. As Apple puts it, there may be some apps that were written before developer ID registration began. As a result, the app may not have been reviewed, and thus macOS can’t check whether the app has been modified or broken since it was released. Similarly, suppose you or your developer friend or someone you have been following for long and trust, build a simple app as a hobby. Is it dangerous? No! It is just not registered with Apple.

The safest approach to install an app from an unidentified developer is by finding a similar alternative app from the Mac App Store or identified developer. Sometimes paying for a similar app may also be a sensible solution than using a free unknown app. But if nothing works for you overriding the security settings and allowing apps from unidentified developers in macOS is a solution. In this sense, macOS is more flexible than iOS.

You may like to read:

The founder of iGeeksBlog, Dhvanesh, is an Apple aficionado, who cannot stand even a slight innuendo about Apple products. He dons the cap of editor-in-chief to make sure that articles match the quality standard before they are published.

  • https://www.igeeksblog.com/author/dhvanesh/
  • https://www.igeeksblog.com/author/dhvanesh/
  • https://www.igeeksblog.com/author/dhvanesh/
  • https://www.igeeksblog.com/author/dhvanesh/

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:

If you are facing this problem while you are downloading & installing DoYourData Software, you can follow these simple steps to solve this issue.

Mac App Store Won't Open

Step 1: Click 'Launchpad' --> Find 'System Preference', and Open it --> Click 'Security & Privacy'.

Step 2: Change the setting, enable your Mac can download from 'Anywhere'.

If you have upgraded your Mac to macOS 10.12 Sierra or higher, you just click 'Open Anyway', like this:

Cannot Open App On Macbook Pro

Step 3: Re-download the software or re-open the download file on your Mac. Then install it on your Mac, you can follow this guide: http://www.doyourdata.com/support/product/mac/install-and-activate-mac-software-doyourdata.html

Can't Open Outlook On Mac

DoYourData Mac software are 100% safe and clean. If you have any question, feel free to contact us by sending an email to [email protected].

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