This hotfix release addresses a number of issues and is recommended for all customers. It is a rollup of all previous/current fixes available for IDR and should be the minimum release going forward.
Informatica Data Replication - 9.5.1 HotFix 4 - Release Notes
PAM for Informatica Data Replication 9.5.1 Hotfix 4
You can download the Hotfix from here.