I have MAC OS version 10.9.9 "Maverick" I am unable to download, update or complete purchase.
As you can see from “Check compatability” here, your iMac is too old to use MacOS Catalina.
High Sierra macOS 10.13.6 is the highest version for your Mac.
Same applies for the 27" model, if that's what you have.
MiniHusky wrote:
I have MAC OS version 10.9.9 "Maverick[s]"
There is no such version. The last version of Mavericks was 10.9.5, released in late 2015-early 2016.
I am unable to download, update or complete purchase.
You have asked us to guess what you might be trying to obtain. We are also being asked to guess the age, model, and assorted hardware features of your Mac. Additionally, we don’t know the steps you have taken, messages you’ve seen, successes, failures, etc.
iMac Mid 2011 OS Version 10.9.5 800 GB free space
Unable to update.
Error message " This Version of macOS 10.15.6 could not be installed on this computer"
Steps taken. Attempted to update via App Store. The link underlined for help if unable to download returns with an error message, page not available. (paraphrase)
I have MAC OS version 10.9.9 "Maverick" I am unable to download, update or complete purchase.
