You'll see a statement which says: Do not attempt to install Patch 6.1 after installing Patch 6.0. Also see KnowledgeBase article 616355. Install Patch 6.1 rather than Patch 6, if you are running the 5300 Engine.
Primarily, Patch 6.1 is not necessary unless you already have the 5300 scan engine installed which most of us don't have at this time. Install Patch 6.1 ONLY if you already have 5300 on the machine. ___________