![]() Please note that whatever you decide to do, you will need to obtain an external hard disk drive. ![]() To learn how to use Time Machine please read How to use Time Machine to back up or restore your Mac - Apple Support. ![]() In either case, the salient point is to select the proper installation volume so as not to inadvertently overwrite your existing installation:Ĭlick that and be sure it's installing where you want it to install.ĭon't do anything without a backup. Go to the developers website here (or use the direct download link from Dropbox here) and. Download a copy of the Install OS X or Install Mac OS X from the Mac App Store under the Purchases tab which matches the version of system. Read About macOS Recovery - Apple Support and Partition a physical disk using Disk Utility - Apple Support. How to Create & Restore a Recovery Partition in Mac OS X. If you want to install HS on a separate partition of the Mac's built-in storage then you need to create that partition first by booting macOS Recovery, followed by partitioning the disk, followed by installing HS on it. To learn how to do that please read Upgrading macOS without fear. Yes it's possible, but if I recommend installing High Sierra on a completely separate disk, to avoid altering your existing Mac in any way.
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