need to update my Mac Pro 2009 with high Sierra where can I get it
where can I download macOS high sierra
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You can get High Sierra from the following link,
Open Safari do not use Firefox,
How to upgrade to macOS High Sierra - Apple Support
Now you have the link have a look at Section 1 and you will see that only Mac Pros from 2010
can upgrade to High Sierra.
Your 2009 Mac Pro can only officially upgrade to El Capitan.