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Reinstall Mac OS Sierra?

I recently upgraded to High Sierra. My most important application, Bias' Peak Pro 6, no longer works properly. I have a Mac Pro (mid-2010) with four hard drives installed. I want to install Sierra on one of the disks, but can't find a Sierra installer in the App Store. Can someone help, please?

Mac Pro, macOS Sierra (10.12.6), MacPro 5,1, with 2.8GHz quad-core

Posted on Dec 15, 2017 2:39 PM

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Posted on Dec 15, 2017 3:15 PM

My bad...


This link is more relevant:


How to download macOS Sierra - Apple Support


As it has exhaustive information... and the direct link to download is:


Get macOS Sierra it is still available on App Store!


Let me know if it was helpful...

4 replies

Reinstall Mac OS Sierra?

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