If you are a developer looking for the actual Software Development Kit to build your own apps:
You can find the official open-source files and portable versions on the following platforms: SourceForge : The primary host for the Canon EOS Digital Info project , where the CanonEosDigitalInfo_v1.4_SDK3.5.zip can be found. : Provides mirrored Windows downloads for camera inspection and management. Official Canon SDK (for Developers)