Bristol_Jonesey
I don't know about X2 because I only bought the download version, but you should find them here:
 
C:\ProgramData\Cakewalk\Dimension Pro\Programs

 
That's where the standard Dim Pro programs are installed on my system, and also here:
C:\Users\All Users\Cakewalk\Dimension Pro\Programs
(I have no idea why)
 
I found the Hollywood FX, Classic keys etc. additional content was all installed here:
C:\Program Files\Cakewalk\Dimension Pro\Programs
 
The above double-install folders could be due to migrating from Producer 8.5 to X2 perhaps?
 

The DimPro Programs location was moved with the 1.5 update see this knowledge base article
 
If you are running both the 1.2 DXi and 1.5 VST you may need both the "All Users" and ProgramData locations. If you are running only 1.5 then ProgramData directory is the only one needed.
 
The Programs in "Program Files" need to be relocated to the appropriate Programs directory in order to be picked up by DimPro. Copy them and refresh the browser with F5.

Thanks! :-)