Mac app store download an error has occurred

 · And this has become a common issue that many users have to face while upgrading Mac to a new operating system. And you may follow below tips to fix this issue: Open Launchpad Delete 'Install macOS Sierra' file with a question mark on it; Reboot Mac and retry to download a new macOS Sierra update Click Apple Menu Select App Store.  · Fixing App Store “Could Not Complete Purchase: Unknown Error” Messages. Verify in both the Mac App Store and iTunes apps that the same Apple ID .  · Joined Messages 3 Motherboard GA-Z68X-UD3H-B3 CPU Intel i5 K GH Graphics AMD Radeon HD Mac. Mobile Phone.

Max OS has been said to be more stable and less troublesome than others operating systems, yet Mac users may also be plagued with a wide variety of problems, such as the Mac is acting slow, it crashes quite often, apps unexpectedly quit, etc. Mac Apps MacRumors attracts a broad audience of both consumers and professionals interested in the latest technologies and products. We also boast an active community focused on purchasing decisions and technical aspects of the iPhone, iPod, iPad, and Mac platforms. Some Mac users are finding an App Store error when attempting to download apps or update apps from the Mac.

Quit your App Store; Run Finder. Go to (CMD+Shift+G): /private/var/folders. Trash all the folders from that folder (e.g. vp, zz). Run App Store and re-try. In case something bad happens, restore these removed files from your Trash. Joined Messages 3 Motherboard GA-Z68X-UD3H-B3 CPU Intel i5 K GH Graphics AMD Radeon HD Mac. Mobile Phone. Fixing App Store “Could Not Complete Purchase: Unknown Error” Messages. Verify in both the Mac App Store and iTunes apps that the same Apple ID account is used for both apps – if it’s not.