The Host Integration Server Product Team has just released the sixth Cumulative Update (CU) for HIS 2009. The cumulative update model is used to package and release product fixes on a more consistent schedule.
HIS 2009 CU6 includes all released fixes for HIS 2009, including all the fixes included in the five previous HIS 2009 cumulative updates. HIS 2009 CU6 includes four new fixes. Details on the included fixes can be found in the following Knowledge Base article:
2851596 Cumulative Update 6 for Host Integration Server 2009
You can download HIS 2009 CU6 via the Hotfix Download Available link in the KB article. You would need to download the CU6 package that matches the HIS 2009 version (x86 or x64) that you have installed.