When downloading the Mojave installer I get a 22.8MB small installer file instead of the 6GB full version.

To build your own full “legit” macOS Mojave installer do the following.

Start the mini installer that you get from the App Store and follow the prompts until you get to the point that it starts counting down to reboot your machine. Quickly CANCEL the reboot.

Once you cancel, you will have the full 6gb installer files since the mini installer downloads all required files. It will create a folder titled “macOS install Data” on the root of your primary hard drive.

Once you have all of the files, you now have to make the installer package by running the following 3 commands in Terminal:

At the command line, first type the following for super user privileges:

sudo -s

mkdir /Applications/Install\ macOS\ Mojave.app/Contents/SharedSupport

cd /macOS\ Install\ Data

find . -mount | cpio -pvdm /Applications/Install\ macOS\ Mojave.app/Contents/SharedSupport

Right click the installer that you originally downloaded from the App Store in your Applications directory and you’ll see that its now 6GB instead of the 23mb or 25mb that you get from the App store.

Source: http://osxdaily.com/2018/09/29/download-full-macos-mojave-installer/

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