Recently purchased the BSK PDF Manger Pro version for a new site and I am so glad we did.
We had over 800 pdf’s on an old site which needed to be transferred to the new site. I contacted Support and over several days was able to successfully transfer every one of them with ease. Support walked me through many stages and helped with the database transfer. Support answered all my emails quickly and with answers I could follow easily.
The plugin also works well with a multi site situation website and a membership private site.