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rosalie249 Author

Level 1

4 points

Install Mojave

I have an iMac C1***NCR running macOS High Sierra 10.13.6. It is running incredibly slowly, taking at least a minute or two to open up any App (e.g. Word) or even to open a document when Word is already open. The hard drive has only used about 10% of its capacity, so it is not overloaded. I thought that perhaps I should instal Mojave, but when I click on Open on the Mojave installation site it tells me that it is "damaged" and can't be run. Any suggestions on what I should do please?

[Edited by Moderator]

iMac 21.5″, macOS 10.13

Posted on Sep 9, 2020 9:15 AM

Top-ranking reply

dialabrain

Level 10

125,537 points

Posted on Sep 9, 2020 9:30 AM

Installing Mojave won't necessarily make your Mac any faster. However, to do so, delete "Install macOS Mojave" from the applications folder then try again while in Safe Mode.

How to use safe mode on your Mac - Apple Support

Before you do that…

Install EtreCheck and post the report. Allow Full Disk Access.

http://etrecheck.com/

Use the Additional Text icon to paste in the report.

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Install Mojave

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