HSO runs fine as VST Sound instrument Set within Halion (4/Sonic/SE).
Groove Agent is problematic. The installer doesn’t work.
But you can manually copy the program from you old system, the vst plugin and component in the library/audio and maybe something else I can’t remember at the moment. Afterwards use the seperate content installer on the installation dvd.
This worked out for me, but this isn’t supported.
Good luck!
Tom