Camera Raw version 8.7 is require to use the raw files from EOS 7D Mark II camera.
Photoshop CS6 can be upgraded to 9.1.1.
However, you need to upgrade your operating system.
System requirements for Photoshop : Photoshop system requirements
How do you update an operating system?
However, there's no need to upgrade OS X to run CS6 since CS6 will run on 10.6.8. Which version of Photoshop are you currently running?
The thing to really consider is whether it's worth your while to pay to upgrade to CS6 which is outdated legacy software, no longer updated by Adobe. Most people here would say no. Lots of $$ for superseded software which not even Adobe wants you to buy.
That leaves you with subscribing to the Cloud, but that WOULD mean an OS X upgrade since the current Cloud version will only run on OS X 10.9 and later.
Best solution? New computer and an Adobe Cloud membership. All because you bought a new camera.
Until you're ready for a new computer, I'd suggest using the DNG converter for all its inconvenience. Why do you say it will not work for you?
I think I am figuring this out. I hope.
Sent from my iPad