I need help installing an specific 3rd Party item
in The Commons
The "SF Weapon Pack" at http://www.porsimo.net/3d/weapons.htm; I have tried dropping the files at my "Daz Connect Library" folder, but it seems not to work. I can find the materials for it in Daz3D, but not the models themselves...

Comments
The Daz Connect library folder is for content isntalled with Connect - you need to merge the folders (the Runtime folder) from the zip into one of the foldrs listed as a Poser Format content directory. The items will then appear in the Content Library pane under Poser Formats>folder isntalled to>Props>Some folder.
Deleted to prevent confusion, since Richard's method worked for you.
This happened, now it looks like I got myself 2 beautiful pistols, thanks both of you, dragonfly_2004 method worked really well