Hey guys, I was recently having the issue where the AppStore would only download a 20MB High Sierra installer, and found this tool on Github that scans Apple's catalog and lists available macOS installer versions. It then downloads and builds whichever you select, negating the need to use the AppStore entirely. It works really well and can also be run in a VM on Windows.
Links:
Tool: https://github.com/munki/macadmin-scripts/blob/master/installinstallmacos.py
Readme: https://github.com/munki/macadmin-scripts/blob/master/docs/installinstallmacos.md
Make sure you have Python 2 installed, and you must run the script as sudo.
After it's done, open the .dmg file it creates in the same directory and drag the installer .app file into Applications.
Then you can just follow the guide here to make the USB: https://support.apple.com/en-us/HT201372
I prefer to use this open source tool over the closed source 'patcher' that gets mentioned here. I'm not sure if there are any other similar solutions, but this worked well for me.
It's 550 lines of Python so you can read through it yourself if there's any concerns.
Hopefully it helps some people!
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