Upgrading Mac Mini Server to Sierra

I have a freshly installed 2012 MAC Mini Server running 10.7.5 Lion OS. I've downloaded the MacOS update from the app store but when trying to install it reboots but says that this version of MAC OS X Server is not compatible please reboot to try again.

Is there anything else I need to do to upgrade this Lion MAC Mini server to a later OS?
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wint100Asked:
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serialbandConnect With a Mentor Commented:
Have you done all your updates first?  Have you downloaded any of the previous versions of Mountain Lion, Mavericks, Yosemite, or El Capitán somewhere, when they were available?  You might have to try upgrading to one of those first.
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strungCommented:
I think you have to upgrade the OS to 10.11.6 or 10.12 first, then upgrade the server package.

https://support.apple.com/en-ca/HT207027
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wint100Author Commented:
I'm trying to upgrade to the non server sierra as this is what gets shown and downloaded in the app store
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Qian BaoDigital Media Specialist and Web DesignerCommented:
Just to clarify again, your Mac Mini Server Edition is running a server edition of Lion? What is your server version? The latest one from Mac App Store is 5.2

https://itunes.apple.com/app/macos-server/id883878097?mt=12

You might want to remove the server component as that might be the cause of the error message.

Check out this post for some related info
https://discussions.apple.com/thread/7394075?start=0&tstart=0
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wint100Author Commented:
I had to first upgrade to El Capitan, then it would let upgrade to MacOS
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