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edited Sep 26, 2017 at 7:39

First, it would appear that you have not downloaded a correct app from the App Store. The correct "Install macOS High Sierra.app" should be a little over 5Gb5.18 GB.

Second, you are using the wrong syntax for the createinstallmedia command in the High Sierra installer. You now don't need the --applicationpath parameter. Check out this Apple support page.

First, it would appear that you have not downloaded a correct app from the App Store. The correct "Install macOS High Sierra.app" should be a little over 5Gb.

Second, you are using the wrong syntax for the createinstallmedia command in the High Sierra installer. You now don't need the --applicationpath parameter. Check out this Apple support page.

First, it would appear that you have not downloaded a correct app from the App Store. The correct "Install macOS High Sierra.app" should be 5.18 GB.

Second, you are using the wrong syntax for the createinstallmedia command in the High Sierra installer. You now don't need the --applicationpath parameter. Check out this Apple support page.

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created Sep 26, 2017 at 4:12

Tony Williams

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First, it would appear that you have not downloaded a correct app from the App Store. The correct "Install macOS High Sierra.app" should be a little over 5Gb.

Second, you are using the wrong syntax for the createinstallmedia command in the High Sierra installer. You now don't need the --applicationpath parameter. Check out this Apple support page.