Other options, because it's good to have options:
P3DO Organiser by Senosoft
Also very useful as a library previewer and manager and a variety of other tasks. It can only load items from your library however, not save them from your scene. I've used the Pro version for many years, but to the best of my knowledge the free version can still do the loading function.
XL Content Library by Dimension3D
XL can do saving as well as loading, however as the author has sadly passed away there is no support as far as I'm aware. This doesn't work very well with Poser 11.2 as the page says, but it will be fine with PP2012.
I also wrote a simple Python script which can load a Poser library file from anywhere on your computer - it isn't as convenient as the two above since you have to remember to go to the Python Scripts menu every time you want to load something, and you don't get any library organisation features or the ability to save, but it doesn't take up any screen space when not in use.
I use a combination of all the above depending on what I'm doing at the time, along with Poser 11's own library, although I operate this through a separate browser window rather than the Poser UI pane.
I still use PP2014 from time to time, and then the above options are invaluable - essential, in fact.
I seem to recall seeing somewhere that there's a replacement for Air available from a third party, but I think I might let others iron out the wrinkles in that before I let it loose on my system!