High Sierra Appstore


I began to figure out what was going on and found out the following. Attempting to download macOS High Sierra from the Mac App Store I found that a small 19 MB version of the “Install macOS High Sierra.app” file downloads to the “Applications” folder, rather than the complete 5.2 GB installer file. That’s the problem. Apr 10, 2020 Other websites that have a link to download High Sierra open a page 'Connecting to the Mac App Store' and then a small pop-up 'Select Application' in which iTunes is selected. Click on Open Link and get a message 'Item Not Available - The item you've requested is not currently available in the U.S. Several macOS users are having trouble with the App Store updates page on some older versions of the OS like High Sierra, Sierra, El Capitan, and quite possibly even versions that date further back. The updates page looks something straight out of a website from the early 2000s and is comprised mainly of text with little to no sign of the use. Bit of a strange one, I'm trying to update my Sierra install to High Sierra. When I'm downloading High Sierra through the AppStore it starts the download but once finished it just deletes its self before starting the installer. I have looked in the Applications folder and all i can see is macOS High Sierra.appdownload but it is only 418kb in size. MacOS Sierra Installer. This is the official macOS Sierra Installer from the Mac App Store. Un-archive the zip and you will get the.app for installing Sierra. A bootable ISO or bootable USB can be made from this installer. Instructions on how to do that are on the Internet/Youtube.

It seems that in releasing Big Sur, Apple has somehow broken its code-signing service for High Sierra apps acquired through the App Store. There’s a comprehensive discussion here: https://discussions.apple.com/thread/252037712?answerId=253880193022&login=true&page=1

High Sierra App Store Not Working

I fell into this hole yesterday when I upgraded my wife’s iMac 12,2 (mid 2011) from El Capitan (10.11) to High Sierra (10.13), the final version that the model will run, so that I could install MS Office 2019 for her. The net result is that any program that needs to be updated through the App Store to run under High Sierra, such as Pages, Keynote and Microsoft Remote Desktop, fails to run and quits with a “code signature invalid” error.

Download High Sierra App Store

The contributors to the above thread have determined that the fault lies at Apple’s end, in the software that validates new software installations. So far Apple has not acknowledged the fault. If it doesn’t resolve it, many people who can’t upgrade beyond High Sierra are going to have to downgrade (if possible) or buy new Macs.