Ooh, it has been a while - and a lot has changed since Sibelius 5. My recommendation at this point is to focus on getting the rest of the necessary tools together (VDL 2.5.5, VDL Template 7.0a) so you're not banging your head against the wall trying to get the "old" stuff working properly (older versions of said items may not be officially supported anymore, I know VDL Template 5.x isn't).
Once you get the remaining ducks in order, and after you've gone through the documentation, come on back here if you run into problems and I'll help you out.
Hugh