Use the Purchases page to try again (But Theres no Debug menu in MacOS High Sierra).

For the record, theres a privatevardbsoftwareupdatejournal.plist file that lists installed updates.

I am on macOS High Sierra version 10.13.4.

I tried various methods available on various forums and Apples website but to no avail.

I believe most of the proposed solutions are not for High Sierra.

High Sierra Failed To Code Several Times

I also feared it might be due to some residual file or I messed up somehow since I have already installeduninstalled Xcode several times.

High Sierra Failed To Download Xcode 10

I later found out that high sierra 10.13.6 requires max of Xcode 10, i went on to download Xcode 10 and it worked fine for me.

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Safe Mode will perform some basic system checks, including testing your Macs hardware, startup disk, and system software.

The answer can usually be attributed to the difference in the relatively small number of beta users versus the large number of users downloading and installing a new official release of the macOS.

When all those new users start to install the OS, the sheer number of Mac hardware, peripherals, and software makes it very likely that some bug that managed to sneak through the beta process will rear its ugly head in the release version.

With any luck, you may be able to either correct the issue, allowing you to finish the installation, or prevent the issue from occurring in the first place.

Some of the installation issues were going to mention can cause loss of data.

Having a Time Machine backup or a clone of your current system can be a lifesaver.

If you dont have a backup system in place, I highly recommend investing in one before you install a new version of macOS.

It may seem odd but the usual cause is a corrupt installer, and simply deleting the installer app and downloading a new copy will likely fix the issue.

The error message seems to occur most often when the Mac installer is downloaded from a third-party site.

Try using Disk Utilitys First Aid capabilities to test and repair your disk, as outlined in First Aid: Verify and Repair HFS, APFS Drives with Disk Utility.

Normally, when you perform a clean install and erase the startup drive, you do so while running the macOS installer from another boot drive, perhaps a USB flash drive that you have cloned the installer to.

Its at this point that the Could Not Find error message is displayed.

Instead of telling you your Wi-Fi or Ethernet network isnt working, the installer displays the above message.

Restart your Mac while holding down the Command R keys to enter recovery.

Start by checking to see if your Mac is actually compatible with a newer version of the OS.

In some cases, you wont be able to upgrade because Apple has dropped support for your older Mac.

Just as before, start by making sure your Mac is compatible with the macOS version youre installing.

You can use the same links listed above to check compatibility.

A rather obscure issue with the Date Time preferences can prevent installation of a new version of the macOS.

If you have a reliable Internet connection, its best to use the option to Set date and time automatically.

You can find instructions for using the Recovery system in the article: Rocket Yard Guide: Everything You Need to Know About OS X Recovery.

The instructions for using Terminal to make time changes are available in: Tech Tip: An Error Occurred While Preparing the Installation Fix.

Follow the instructions in: First Aid: Verify and Repair HFS, APFS Drives with Disk Utility.

Mac Os High Sierra Failed To Download