Photoshop CC 2014 is the latest Photoshop release of the Photography Plan and will be getting the new features upgrades. You may have it alongside Photoshop CC and Photoshop CS6, but CC 2014 is the latest upgrade. The upside is you get free upgrades as part of the plan.
Don't for get to download Bridge CC as well. it's part of the package.
As Gene says, you have CC2014 already. No need to "upgrade" anything at all.
Read up a bit on your plan. You are paying for it and should make full use of your software.
Don't "assume" anything, check up on the facts. Read your user guide and all other documentation.