It’s very useful to also have copies of all of your license information for Mac apps, since those that require a license or activation will need to be set up after your clean install. In addition, be sure that you know all of your online account passwords and logins - for this, a password manager like 1Password can be very useful. Make sure that you have access to all installation media for your apps (developer websites, Mac App Store, DVD or CD), and it’s a good idea to make a Note of all apps that you wish to re-install. Clean installs are also useful if a software or system software update has somehow trashed your existing operating system or if you have replaced a hard drive.īe sure you have plenty of time available to complete the complete install, as it can sometimes take as much as a day to go through all the steps.Īs noted, we’re going to completely erase everything on the Mac.
#Sierra mac os download install#
In many cases, a clean install can improve the performance of a sluggish Mac.
The idea behind a clean install is to start with a completely bare machine, getting rid of any old data, files, preferences, settings, old drivers, apps you no longer use, and so on.
#Sierra mac os download how to#
In this post, we’ll describe how to do a clean install of macOS 10.13 High Sierra.īefore we get started, make a decision as to whether you want to do a regular update or a clean install, because a regular update is much easier to perform than a clean install. What’s a clean install? That means that the hard drive is erased completely and reformatted, which removes not only the current Mac operating system but all data, files, applications, you name it… Just think of it as a brand new computer having the operating system installed on it for the first time. 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.Sometimes it’s a good idea to do a clean install of a new Mac operating system version. 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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