I just recently bought VDL 2.5 and Demystified as well as the templates. After much trial and error, I finally have it working on my personal laptop (hooray!). I am having some issues getting things working on my school computer.
I am running Sib 7.5 on Macbook Pro with Mavericks on both machines (one is 2010, one is 2012)
When I open a score using a typical playback configuration (2 instances of Kontact, 1 instance of Sib 7 sounds for winds) the Sib 7 percussion sounds over-ride the VDL sounds. When I deactivate the Sib7 Sounds in this playback configuration, the VDL sounds for percussion are working, however the wind sounds are now just a piano.