The Sforzando VSTi is already in my list showing it's available to use John, however when I do as you have suggested I get a pop up saying "Can't find install directory, please reinstall"

Also if I go to add a VSTi plugin I'm taken to the directory where sforzando is, which is - C:/Program Files (x86) - VstPlugins. If I click on it I get the same pop up "Can't find install directory, please reinstall".

I have BIAB installed on another Partition on my Hard Drive which is "E" and when I install BIAB and any extras and patches etc I always direct them to the E drive, I also did this when I selected to install Sforzando on it's own but obviously it's ended up in C:/, so I'm now wondering if this could the reason, do I have install BIAB to my C drive? and if this is the case what happens when you run BIAB from an external USB drive?