We generally support a particular version of an OS for about 5 years. Mac OS X 10.4 is more than 6 years old now. Apple no longer updates 10.4 even for security issues and most of the sites that report version statistics indicate that usage of 10.4 is at about 5% to 10%. The longer we support older versions of any operating system, the fewer resources we have to support the newer, more modern releases.
With that in mind, Real Studio 2011 R4, due in November, will be the last release to officially support Mac OS X 10.4. We wanted to make sure you knew this ahead of time so you could plan accordingly.