Try these steps if you can't connect to any of these apps:

Mac App Store is the simplest way to find and download apps for your Mac. To download apps from the Mac App Store, you need a Mac with OS X 10.6.6 or later.

Check the system status page

Check Apple’s System Status page to see if there’s an outage for a service in your country or region.

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Make sure that your device is connected to the Internet

Use any Internet browser to connect to any website. If nothing loads, use another device on the same network to see if it can connect to any website. If no other devices can access the Internet, turn off your Wi-Fi router, then turn it on again to reset it. If you still can’t connect to your Wi-Fi network, contact your Internet provider for more help. If only your first device can’t connect to the Internet, get help with Wi-Fi on your iPhone, iPad, or iPod touch, Apple Watch, Apple TV, or Mac.

If you use cellular service to connect to the Internet on your iPhone or iPad, make sure that you have cellular data turned on for the app that you're using. To do this, open the Settings app, tap Cellular, then turn on Cellular Data.

Update your software

Update to the latest version of iOS or iPadOS, macOS, tvOS, watchOS, or software for your non-Apple device. Then try to connect again.

Check the date and time

Make sure that the date and time on your device are set correctly for your time zone.

On your iPhone, iPad, iPod touch: Open the Settings app. Tap General, then tap Date & Time. Get more help with date and time.
On your Mac: Open System Preferences, then choose Date & Time.
On your Apple TV: Go to Settings > General > Date and Time.

If the date and time are incorrect, update them or turn on the option to set date and time automatically.

If you see a different connection alert message

Use the steps above if you see one of these error messages:

• 'Cannot connect to the iTunes Store. An unknown error has occurred.'
• 'We could not complete your iTunes Store request. The iTunes Store is temporarily unavailable. Please try again later.'
• 'Could not connect to the iTunes Store. Make sure your network connection is active and try again.'
• 'We could not complete your iTunes Store request. The network connection could not be established. There was an error in the iTunes Store. Please try again later.'

Related topics

• If you're connected but you can't download content, change your Apple ID password. You might have to sign out and sign in again. If you're asked to verify your payment information, make sure that all payment details match what's on file with your financial institution.
• If you're connected but you can't download or update apps, pause and restart the app download or restart your device.
• Learn what to try if you also see pop-ups in Safari on your Mac.
• Learn what to do if you see error -45054 on your computer.
• With iTunes for Windows, check to see if you turned on third-party security software or Windows Firewall.
• If you’ve tried all of the above steps and you still can’t connect, contact Apple Support.

Store availability and features might vary by country or region. Learn more about what's available in your country or region.

Check compatibility

You can upgrade to macOS High Sierra from OS X Mountain Lion or later on any of the following Mac models. Your Mac also needs at least 2GB of memory and 14.3GB of available storage space.

MacBook introduced in late 2009 or later
MacBook Air introduced in late 2010 or later
MacBook Pro introduced in mid 2010 or later
Mac mini introduced in mid 2010 or later
iMac introduced in late 2009 or later
Mac Pro introduced in mid 2010 or later

To find your Mac model, memory, storage space, and macOS version, choose About This Mac from the Apple menu . If your Mac isn't compatible with macOS High Sierra, the installer will let you know.

Make a backup

Before installing any upgrade, 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.

Get connected

It takes time to download and install macOS, so make sure that you have a reliable Internet connection. If you're using a Mac notebook computer, plug it into AC power.

Download macOS High Sierra

For the strongest security and latest features, find out whether you can upgrade to macOS Catalina, the latest version of the Mac operating system.

If you still need macOS High Sierra, use this App Store link: Get macOS High Sierra.

Begin installation

After downloading, the installer opens automatically.

Click Continue and follow the onscreen instructions. You might find it 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.

App Store For Mac Mini Ipad

Allow installation to complete

Mac Apps Download

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 both macOS and related updates to your Mac firmware.

Learn more

App Store For Mac Mini Pro

• If you have hardware or software that isn't compatible with High Sierra, you might be able to install an earlier macOS, such as Sierra or El Capitan.
• macOS High Sierra won't install on top of a later version of macOS, but you can erase your disk first or install on another disk.
• You can use macOS Recovery to reinstall macOS.