Played around and answered my own question.
The installer, installs the dlls (I understand these are the VSTs). Directly under Program Files (x86) if you don't change the install location (I assumed it would put these in the "rgcaudio Triangle II" folder it already placed there - but it did not.
Either way, the better place for these files is - C:\Program Files (x86)\Cakewalk\Vstplugins\TriangleII
I created this folder and placed these files in it:
T2DXi.dll
Triangle II.dll
Triangle II.exe
There was already a beatscape folder:
C:\Program Files (x86)\Cakewalk\Vstplugins\Beatscape
Still not quite there:
In Sonar (this is Sonar X2, btw but X1 seems similar).
Under "Edit" menu select "Preferences"
"File" "VST Settings"
"VST Scan Folders" "Add"
And add the folder:
C:\Program Files (x86)\Cakewalk\Vstplugins
The 64 bit folder:
C:\Program Files\Cakewalk\Vstplugins was already there - don't remove this one.
When I exited and restarted cakewalk the TriangleII 32 bit showed up and worked (also beatscape showed up and worked).
Triangle II without the 32 bit indicator - is still there and still doesn't work.
Thanks,
- Matt