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Apple has introduced a number of features designed to protect users from malware in OS X, but these tools occasionally go too far when trying to save people from themselves.
TL;DR:If you have an app from an unidentified developer and you're sure the app is safe, you can force it to run by right clicking (or command-clicking) the app and choosing 'Open' from the context menu.
OS X's Gatekeeper feature — introduced with OS X Mountain Lion — places restrictions on which apps can be run on a Mac based on the avenue through which the apps were acquired. How do i split a video on my iphone. There are three tiers: apps which are distributed by registered developers through the Mac App Store, apps which are distributed by registered developers outside of the Mac App Store, and apps which are not made by registered developers.
Gatekeeper distinguishes between the latter two based, broadly, on whether the app has been signed with a legitimate Apple-issued signing key.
By default, Gatekeeper is configured to allow apps from the Mac App Store and from registered developers. Users can make this more or less strict:
Unless you choose to allow apps downloaded from anywhere, OS X will warn you against opening apps that aren't signed: you'll see a dialog box that says ' can't be opened because it is from an unidentified developer,' and clicking OK will simply close the dialog.
If you're sure the app is safe, you don't need to alter your security preferences to open it — there's a faster workaround.
Right click (or command-click) on the app and select 'Open' from the context menu. This will present a slightly different dialog box: this time, you'll be presented with an 'Open' button that will let you force OS X to run the app.
Remember: only do this if you're sure the app is from a reputable developer and has not been tampered with.
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To get the latest features and maintain the security, stability, compatibility, and performance of your Mac, it's important to keep your software up to date. Apple recommends that you always use the latest macOS that is compatible with your Mac.
Learn how to upgrade to macOS Big Sur, the latest version of macOS.
Check compatibility
If a macOS installer can't be used on your Mac, the installer will let you know. For example, it might say that it's too old to be opened on this version of macOS, or that your Mac doesn't have enough free storage space for the installation.
To confirm compatibility before downloading, check the minimum requirements for macOS Catalina, Mojave, High Sierra, Sierra, El Capitan, or Yosemite. You can also find compatibility information on the product-ID page for MacBook Pro, MacBook Air, MacBook, iMac, Mac mini, or Mac Pro.
Make a backup
Before installing, it’s a good idea to back up your Mac. Time Machine makes it simple, and other backup methods are also available. Learn how to back up your Mac.
Download macOS
It takes time to download and install macOS, so make sure that you're plugged into AC power and have a reliable internet connection.
Safari uses these links to find the old installers in the App Store. After downloading from the App Store, the installer opens automatically.
![]() How To Install Mac App Store On Macbook Pro 2018
Safari downloads the following older installers as a disk image named InstallOS.dmg or InstallMacOSX.dmg. Open the disk image, then open the .pkg installer inside the disk image. It installs an app named Install [Version Name]. Open that app from your Applications folder to begin installing the operating system.
How To Install Mac App Store On Macbook ShortcutInstall macOS
Follow the onscreen instructions in the installer. It might be easiest to begin installation in the evening so that it can complete overnight, if needed.
If the installer asks for permission to install a helper tool, enter the administrator name and password that you use to log in to your Mac, then click Add Helper.
How To Install Mac App Store
Please allow installation to complete without putting your Mac to sleep or closing its lid. Your Mac might restart, show a progress bar, or show a blank screen several times as it installs macOS and related firmware updates.
Can't Install App On MacLearn moreHow To Delete Apps On Mac
You might also be able to use macOS Recovery to reinstall the macOS you're using now, upgrade to the latest compatible macOS, or install the macOS that came with your Mac.
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