The Cubase dvd’s have Halion SE2 content which is compleletly different from the Halion 5/Halion Sonic2 content.
Since the Halion Sonic SE engine (part of the cubase package) is a smaller brother from Halion 5, the content is included in the content available to the bigger members of the family. So you will see 3 different synths when everything is installed properly:
- Halion 5
- Halion Sonic 2 (comes bundled with Halion 5)
- Halion Sonic SE2
The combination of Cubase + Halion 5 gives you the following content in the Halion 5 browser:
- Halion 4 content
- Halion Sonic Factory content
- Halion SE2 Pro
- Halion SE2 Artist/hybrid
- Halion SE2 Basic
In halion Sonic SE2 you will only see the Halion SE2 content.
In halion Sonic 2 you will have the content of Halion Sonic SE2 and Halion Sonic Factory content.
WHen editing in Halion 5 and Halion Sonic 2, best remember that the Halion Sonic SE2 content is copy protected. So you do not see anything below the macro pages. This is a bit confusing when going through things the first time. 
Have fun !
kind regards,
R.