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You can check the compatibility list for Macs that support macOS High Sierra here, generally speaking if the Mac runs Sierra and is reasonably modern, it should work. If macOS High Sierra will not proceed with installation on the Mac, usually with a notification along the lines of вЂњmacOS High Sierra cannot be installedвЂќ, it is likely because the Mac is not compatible with High Sierra.

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MacOS High Sierra cannot be installed, or refuses to install on a Mac This should resolve most issues with failed installation attempts.

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Reboot the Mac, then attempt to re-install Mac OS High Sierra using the вЂњInstall macOS High Sierra.appвЂќ app again.

If you get package missing errors or damaged application errors, delete the вЂњInstall macOS High Sierra.appвЂќ from the /Applications/ folder on the Mac, then re-download the installer from the Mac App Store. Quit the installer to restart your computer and try again.вЂќ Quit the installer to restart your computer and try again.вЂќ or, rarely, more obscure error messages with вЂњmacOS could not be installed on your computerвЂќ or вЂњAn error occurred while verifying firmware. There are various error messages that may be seen in this including: вЂњThe path /System/Installation/Packages/OSInstall.mpkg appears to be missing or damaged. If installation fails, usually in a very obvious manner with an error message when attempting to install the High Sierra update, the solution is usually to redownload the installer and then reinstall macOS High Sierra.

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This prevents the user from creating a USB installer for MacOS High Sierra.ДЄ workaround for this issue is to use a third party tool to download the complete macOS High Sierra installer as discussed here. Some users report they are unable to download the complete macOS High Sierra installer app, and instead wind up with a small 20mb version that attempts to download the remainder of the installer during the installation itself. MacOS High Sierra Installer is Incomplete or Unable to Make a USB Drive Rarely, you may need to reboot the Mac as well вЂ“ this should not be necessary however.

Relaunch the Mac App Store and try to download macOS High Sierra again.

Often simply relaunching the App Store is sufficient to remedy a download problem as well. If this happens, the first thing you should do is be sure your Mac is connected to the internet and has a functioning internet connection. Some users report errors trying to download macOS High Sierra from the Mac App Store. Dive in, and report your own experiences in the comments below. There are mixed reports of some Mac users updating to macOS High Sierra and then experiencing a range of problems, from problems installing or downloading the installer, to rapid battery life draining, inability for some apps to open, apps crashing, strange performance problems or overall performance degradation, problems with mounting and reading disks, problems with networking connectivity and wi-fi, issues with graphics or displays, amongst a variety of other issues that can be frustrating.