how to upgrade from os x 10.9.5
I have a haver an early 2009 mac desktop, how do I upgrade the OS, it is currently os x 10.9.5
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It cannot be upgraded beyond El Capitan 10.11.6 See the following from Identify your iMac model - Apple Support
iMac (24-inch, Early 2009)
Model Identifier: iMac9,1
Part Number: MB418xx/A, MB419xx/A
Latest compatible operating system: OS X El Capitan 10.11.6
iMac (20-inch, Early 2009)
Model Identifier: iMac9,1
Part Number: MB417xx/A, MC019xx/A
Latest compatible operating system: OS X El Capitan 10.11.6
To upgrade, see information in How to download macOS - Apple Support