I am trying to upgrade my iMac (27", mid 2011) currently running 10.11.6 (El Capitan) to High Sierra 10.13.6.
All information I can find tells me I can do this but when I go into my software updates it does not show it.
I have downloaded 10.13.6 but when I click it to install it tells me I need 10.13. Do I need to upgrade to Sierra before upgrading to High Sierra?
I can't find 10.13.
Earlier Mac models
You should be able to upgrade directly to 10.13.6. See the options described in How to download and install macOS - Apple Support
You should be able to upgrade directly to 10.13.6. See the options described in How to download and install macOS - Apple Support
Yes, as FoxFifth states, you've downloaded an update installer from the Apple Downloads page. Those downloads are not appropriate for the task at hand.
The document that FoxFifth posted includes another link within that will take you to the appropriate download in the App Store.
It appears that you obtained an update from somewhere rather than an upgrade. See the instructions in App Store section of How to download and install macOS - Apple Support
I have tried what I can from that link but I can't get passed this...
Well it worked, I'm upgraded to 10.13.6.
Thank you for your help!
Trouble upgrading iMac (27", mid 2011) to High Sierra
