FWIW in X series SONAR Producer, Session Drummer 3 is listed as "Session Drummer" in the browser and synth menu. The Session Drummer 3 UI shows "Session Drummer 3" in the upper left hand side of the drumkit view. Unless you own a very old version of SONAR, you would not have the original Session Drummer which is a completely different tool. To your question of how to install individual plug-ins from a download version of SONAR, you need to download the installer files and run the advanced install option. The advanced install permits installation of individual components. It is probably unnecessary if you see "Session Drummer" in your synth list, you already have Session Drummer 3 installed.
 
To your previous post, one way SD3 will play without any apparent input is if the play transport button in on in the SD3 transport UI when SONAR is playing.

Thanks scook for the prompt assistance you have been so kind as to help me
with.  Indeed now - at your instructions - I see on the Drumkit itself the
logo Session Drummer 3 although in the drop down list it only lists Session
Drummer.  

I'm not sure how the play button could have gotten turned on but that seems to have solved the problem.  I am so new to Session Drummer that I did not even realize that this button was there.  Thanks for the suggestion and solution - much appreciated.
 
Dave W.

""" Since I do not even have disks anymore because of upgrading through Cakewalk website I'm not sure what to do there.  """
 
So what are you gonna do when the computer crashes and you have to start over ????
 
The rule:  never, never, never, never trash the disks.  
 
I have ALL of the CW/Sonar disks, plus copies, and images on hard disk.  I often use VSampler. Need Sonar 6 to install the included libraries.

jm24,
 
I have not had original Cakewalk Discs since Sonar 9.  I have been upgrading through the Cakewalk site and downloading the upgrade files.  It's not near as handy as having the good ole disk to pop in but in the case of a computer crash I guess I could re-download it from the Cakewalk web site.  It's just not easy to re-download just a portion or two that way - if you get my drift.  I have backups of my current Sonar X1 Producer program but they are mostly RAR compressed files which would require re-doing the whole program instead of just maybe the Session Drummer.  Thanks for your sound advice.

If you wish, it is possible to create a set of install disks from the downloads. To do so requires unpacking the RAR archives with a tool like 7-zip. Create a disk for each of the file groups 02 through 05. Fortunately performing an advanced install was not necessary for the issues in this thread. It is not that bad doing an advanced install from the download files, it would have to expand the 02 set completely before asking about the install type though.

I have also only downloaded the most recent versions.
 
I have disks of all the software.  And I have folders on backup drives with all versions expanded and ready for installation.
 
This means I can quickly install any of the included programs, plugins,... from any version.
 

scook - thanks for the unpacking expertise. 
 
jm24 it is great to know that you also have downloaded and have been able to make backup disks of your downloads without having to pay additional monies.
 
thanks to all for their input.  it is great to know that there are kind people willing to lend assistance.