I'm using using macOS Sierra Version 10.12.6 on an iMac (21.5-inch, late 2009) and want to upgrade to High Sierra. I've downloaded High Sierra (10.13) from the Apple Store but get an Error message when trying to install the new OS onto the iMac.

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I'm using using macOS Sierra Version 10.12.6 on an iMac (21.5-inch, late 2009) and want to upgrade to High Sierra. I've downloaded High Sierra (10.13) from the Apple Store but get an Error message when trying to install the new OS onto the iMac.

I'm using using macOS Sierra Version 10.12.6 on an iMac (21.5-inch, late 2009) and want to upgrade to High Sierra. I've downloaded High Sierra (10.13) from the Apple Store but get an Error message when trying to install the new OS onto the iMac. Can anyone help me solve this problem?

iMac, macOS 10.12

Posted on Nov 27, 2022 11:42 AM

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BDAqua

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Nov 27, 2022 1:37 PM in response to orleansbud

What is the error?

If you get a corrupted message...

Naw, not damaged, it's just that you have an old copy already in Applications, there are 2 cures...

If you’re short of bandwidth or data… Disconnect from the Internet & set the Date back to 2014, then you can run the Install MacsOS High Sierra App in Applications, so expired Certificates are not expired.

Or... trash the Install MacsOS High Sierra.app in Applications, empty trash & restart, then a new copy of a more recent version can be downloaded…

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I'm using using macOS Sierra Version 10.12.6 on an iMac (21.5-inch, late 2009) and want to upgrade to High Sierra. I've downloaded High Sierra (10.13) from the Apple Store but get an Error message when trying to install the new OS onto the iMac.

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