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Have the Install macOS High Sierra.app in your Applications folder, and a 16GB USB stick named MyVolume, then follow the instructions here on how to create the bootable USB installer. It is also possible to make a bootable USB stick with the High Sierra installer on it. Knowing that, I should be able to see the previous version in the App Store as. I have previously upgraded my personal computer as follows: El Capitan -> Sierra -> High Sierra. It is a good idea to keep a copy safe on an external drive should you ever need to reinstall macOS High Sierra (saves having to go through the painful download process or having to access the unreliable Apple Recovery Servers) or want to install it on another mac you have. I have a MacBook Pro running El Capitan that I need to upgrade to Sierra 10.12 (not High Sierra) for development reasons. When the download has completed and you have confirmed it is 5.23GBs in size then please make a copy of it for safe keeping, As I say the one in the Applications folder will self delete after you complete the installation. C How to Download and upgrade from Mac OS 'Sierra' 10.12.6. When Apple releases macOS 10.14, OS X 10.11 El Capitan will very likely no longer be supported. How to Download and upgrade from Mac OS 'Sierra' 10.12.6 to Mac OS High Sierra' 10.13.6 & Install HD. This release is supported with security updates, and the previous releasesmacOS 10.12 Sierra and OS X 10.11 El Capitanwere also supported. And also make sure the iMac is connected to your router via cable and not WiFi. If a version of macOS isn’t receiving new updates, it isn’t supported anymore.
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Restart your mac and go back to the App Store and try the download again, make sure the App Store says 'Get'. Ok on your iMac you have macOS High Sierra.appdownload, as you can see it is only 415kbs, move it to the Trash and empty the Trash. If you have downloaded it to your laptop and installed it the Install macOS High Sierra.app self deletes after installing, whereas you could have just made a copy prior to installing so that you could move it over to your iMac. Wish you had told me you were trying to install macOS High Sierra on two different macs.