

If there is an update available, update the software on your Mac by following the on-screen instructions.

If you are running macOS Mojave or later, go to System Preferences > Software Update and then click Check for Updates. Make sure that your operating system is up to date. If you are using a VPN or proxy to connect to the Internet, disable them to see if that fixes your problem.Open the App Store on your Mac and then click Store (top menu bar) and click Sing Out and then sing back in.From the top menu bar, click Account and then Sign out.

You’ll know when the service is working again. If this the case, there is little you can do. For instance, currently, it is saying “Mac App Store – Completed Maintenance. 1.7% of users were affected. Customers may have been unable to make purchases from the App Store, iTunes Store, iBooks Store, or Mac App Store.” As you can see, the Mac App Store was down for some users, and but now it is fixed. It is possible that the App Store service is having issues with its servers or systems. Go to Apple’s System Status website and check.
