OS X 10.13.0 download

Ok so you are wrong.

Follow the instructions. open Safari, click on the link in Ethans post

as you say click on Get macOS High Sierra this will open the App Store

at the High Sierra page.

Can you not see from the screenshot provided that it is available.

And that will download the full installer for High Sierra,

that is all you need.

Forget about the update you downloaded, from the Apple Support Downloads site

that would only install if you were already running an earlier version of High Sierra,

that is the second time I have told you this.

Please connect your mac to your router via cable rather than WiFi.

So just to repeat, open Safari, do not use any other browser,

click on this link,

How to upgrade to macOS High Sierra - Apple Support

Go to Section 4 and click on Get macOS High Sierra,

this will link wit the App store and open at the High Sierra

download page, it should say 'Get' press that to start downloading

High Sierra.

It does work, it does work, it does work.