Realflight 8 and Mission planner Missing feature

I am trying to conenct Real flight 8 with mission planner but no luck. they are both on the same pc. the problem is i cant find the option to enable the flight axis as the documentation suggests here.

under settings>physics there is no such option for flight axis as stated. Please help. thanks

With RF8 you need 8.0.55 exact version.
If you bought it from steam then follow the instructions on this link.

I have bought it on cd … the version says 8.00.056 that wouldnt work ? how do i downgrade to the 55 version.

it is on the same link

DVD and Tower Hobbies Digital versions:

Start the RealFlight 8 Launcher
Click Technical Support
Click Update to Specific Version, choose 8.00.055 from the list, and click OK