SDK Patch Release build version 12.0.0.44 is available for download. This version of the SDK is fully backward compatible with StarTeam Servers 2009 (11.0), 2009 R2 (11.5) and 12.0 and forward compatible with StarTeam Server 12.5 and 13.0.
The link to the readme is ftp://us.ftp.microfocus.com/Starteam/st-sdk-12.0-readme.htm