Type Apple Software Update in the search field. How to use Apple Software Update for Windows Click on the Windows icon in the lower-left corner of your Windows screen. Why do you need to update your computer software What happens if you don t?.What happens if you don’t update your iPhone software?.Where is Apple Software Update on my computer?.How do I install Apple software on my PC?.How do I manually install an Apple software update on my PC?.How do I download Apple software update?.Does Windows 10 need Apple Software Update?.How do I download the Apple Software Update for Windows 10?.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. 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. 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.
And also make sure the iMac is connected to your router via cable and not WiFi. 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.
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