I am having some problems with Pages, and the tech suggested re-installing High Sierra. But I failed to ask if I first need to uninstall the High Sierra that is alread on my laptop. If yes, how do I do an uninstall?
MacBook Pro with Retina display, iOS 10.2.1
Don't erase the disk.
Read How to reinstall macOS - Apple Support and follow Steps 1 - 3 under "Install macOS".
You probably ought to describe the problems you're having with Pages. Reinstalling macOS doesn't usually solve anything, unless you used some non-Apple "cleaning" product to mess up your Mac, in which case that product must be removed first. More information is necessary.
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Clarify on how to reinstall High Sierra
