RTIR 4.0.2 is now available as a maintenance release, primarily providing updates for compatibility with RT 4.4.5. Our documentation site has notes on upgrading and detailed release notes. If you run RTIR and you upgrade RT to 4.4.5, you also need to update to RTIR 4.0.2.
RT 5.0.2 and RTIR 5.0.1 are also now available and earlier versions can be upgraded to these versions as well. We encourage all users running earlier versions to consider upgrading to the newest releases.