Kari developed it as an experimental project… outside the Isotammi collection.
There are a few others like that. For example: Hans’ Consanguinuity Gramplet is waiting to be distributed. And Chis’ CardView is in beta while his Ancestry tools are standalone Python modules.
You’ll have to download and add it to your plugins manually.
Those filters listed in the Isotammi project are used with the SuperTool, they are not needed for FilterParams.