Upgrade from OS X 10.12.6 to High Sierra 10.13.0

There is no requirement to upgrade to an intermediate version prior to upgrading to Mojave. As always, have a backup prior to doing any update/upgrade.

macOS - How to Upgrade - Apple (CA)

Yes, that is the silly stump of the installer, nobody knows why most get the stump, which when run downloads the rest from the Internet out of your control, & a few get the full installer.

Alternate Method: How to Manually Build a Full Installer...

The High Sierra instructions...

http://osxdaily.com/2017/09/27/download-complete-macos-high-sierra-installer/

Could you be trying to install The 10.13.6 Combo Update?

Have you tried this?

https://itunes.apple.com/app/macos-high-sierra/id1246284741?mt=12

You sure you need 10.13.0???

https://itunes.apple.com/app/macos-high-sierra/id1246284741?mt=12

Well, there is no way to get a 10.13.0 installer.

In System Report, what does yours say for this...

Hardware Overview:

Model Name: iMac

Model Identifier: iMac12,1

Processor Name: Intel Core i5

Processor Speed: 2.5 GHz

Number of Processors: 1

Total Number of Cores: 4

L2 Cache (per Core): 256 KB

L3 Cache: 6 MB

Memory: 24 GB

Boot ROM Version: 85.0.0.0.0

have you checked the app store.

I'm not recommending reducing the RAM permanently, just for testing the install.

Some have had trouble with installers if more than 1 drive was attached also.

Nobody knows why most get get stump of the installer & a few get the 5GB+ full installer.

Workaround to get the Full High Sierra instructions...

http://osxdaily.com/2017/09/27/download-complete-macos-high-sierra-installer/

As Barney says you need to get the Firmware update before it will do the 10.13.6 update... you may have to disconnect all but one internal drive.

Nice machine... I'd try less RAM, like 32 GB tops.

My 10.12.6 MP...

Hardware Overview:

Model Name: Mac Pro

Model Identifier: MacPro5,1

Processor Name: 6-Core Intel Xeon

Processor Speed: 2.93 GHz

Number of Processors: 2

Total Number of Cores: 12

L2 Cache (per Core): 256 KB

L3 Cache (per Processor): 12 MB

Memory: 16 GB

Processor Interconnect Speed: 6.4 GT/s

Boot ROM Version: MP51.007F.B03

So Firmware update isn't working, there is a special MP5,1 Firmware update in the 10.13.6 Installer.

Click here.

dialabrain and stedman1: Trian1 is on a 2012 Mac Pro. There is a requirement to install High Sierra first on this model.

(172122)

Thanks Niel.

Thanks. For some reason I read a MacBook Pro. My eyes are deceiving me.