Updating Operating System to play Diablo 3 My girlfriend has a MacBook Air 2012 and we were thinking of playing Diablo 3 together. When she tried to install Diablo 3, she got an error saying that her operating system is outdated. She tried to update her operating system but received an error that she cannot update her OS. I have several questions:


Does Apple impose an operating system cap because her Mac is too old?
Is it advisable to upgrade her operating system to the lastest version, or would it be too much of a strain on her system resource?


Macbook Air 2012: Spec
https://support.apple.com/kb/sp670?locale=en_US


i5 - 1.8Ghz
HD Graphics 4000
4GB RAM
128GB SSD
Just doing a quick search, we can find the System requirements for Diablo III we see that the minimum macOS requirement is El Capitan (10.11). If you are using Yosemite (10.10) or Mavericks (10.9), this game will not work.



We also see that it's capable of running on Sierra (10.12).  You should be able to upgrade to at least El Cap with no performance issues.

To address your specific questions:


  Does Apple impose an operating system cap because her Mac is too old?


Yes.  In fact, with the release of Sierra, many vintage Macs were left out in the cold.


  Is it advisable to upgrade her operating system to the lastest
  version, or would it be too much of a strain on her system resource?


It's not a requirement to upgrade unless you need to, but given your case that you wish to use a specific application (game), it's necessary.  It's always advisable to upgrade as there are lots of fixes and added features with new releases.