Right now Adobe have 50 different programs
- for developing against InDesign CS6 you need to be part of Adobe Solution Partner program which in fact is Technology Partner program
- for developing against InDesign CC you need to apply for Adobe InDesign Prerelease program
- for downloading old SDKs you don't need to do anything
- for downloading new SDK you need to apply for new program.
Thanks for you reply, and could you please help me for how to apply for new program.