This message was posted on behalf of Intel Corporation
Yes you are right the R200 is no longer supported in the SDK R3. If you will like to use the R200 I will recommend to use the SDK R2, you can download it from this thread Re: SDK old versions .
Hope you find this information useful, have a nice day!
Intel began to change its RealSense focus away from mobile last summer, dropping the Smartphone Development Kit and Atom mobile processor. Its focus is now on the SR-300 'desktop' cam and the robotics development kit, plus products that use the RealSense camera such as the Aero drone kit and Project Alloy mixed-reality headset..
As Jose said above, R200 users will need to use the older R2 SDK. An alternative option for R200 developers that will probably continue to receive updates may be the open-source librealsense SDK.