Specifically these files:
 - Session-Atmospheric-007
 - Session-Guitars-007
 - Session-Keys-007
 - Session-Orchestral-007
 - Session-Synths-008
 
The installers insist on installing them to C:\...  This is my system SSD drive -- I never install content there.  Cheers...

You can reassign those paths during the install (button to the right of the default path shown). My Cakewalk Content was already on my F drive so I simply changed the C to F on the lower path.

Edit: I also ran those installers manually.

Wow, that was quick...thanks!
 
But I think you answered where to install the Rapture Session "content".  I too redirected those files to a different drive (as you mentioned). 
 
What I'm trying to do is to change the "expansion pack" paths.  I should mention that I'm doing this by manually running the installers. Unfortunately these installers do not give you the option of choosing the install directory.

Hmmm, my SSD is old and hates unpacking and then installing, so I used 7zip to unpack the downloaded exe files. Interestingly there are TWO exe files within it (same name) so I told 7zip to autoname the second it found. When I ran those installers, I used the original-named one, and the install path was assignable.

Because that worked, I didn't even launch the other exe to check it, so may be another difference.
 
Edit: I just sat down to check that again, the content paths were assigned with the installation of Rapture Session only). Do that one first. The content files simply adhered to the path chosen from installing Rapture Session.

Brilliant.  It didn't even occur to me to try that.  And it worked like a charm -- thanks!
 
BTW, I noticed that you live in Maryland.  So do I.  We may be neighbors...

LOL, figures, I edited my above post when you replied. The content packs actually install directly to the path chosen during the install of Rapture Session.
 
I am up in the Northeast corner or Maryland, but folks had little creativity naming towns, so when I say I am closest to "North East, MD" I always get "Where in Northeast MD?" so I just tell them the Baltimore area.

mettelus
Edit: I just sat down to check that again, the content paths were assigned with the installation of Rapture Session only). Do that one first. The content files simply adhered to the path chosen from installing Rapture Session.

That worked.  But Rapture Session still is not able to find those files -- I get a transient red error message when I try to load those samples.
 
I searched for the path in the registry but didn't find it.  I guess it must be stored internal to Rapture or Sonar.

mettelus
I am up in the Northeast corner or Maryland, but folks had little creativity naming towns, so when I say I am closest to "North East, MD" I always get "Where in Northeast MD?" so I just tell them the Baltimore area.

That's pretty funny. It reminds me of the first time I heard of Hollywood, MD and California, MD.  Imagine living in one of those places and trying to explain it to someone.
 
Well, since I live north of DC, I guess we're distant neighbors. Cheers...

mettelus
The content packs actually install directly to the path chosen during the install of Rapture Session.

 
I think I figured out why only some samples are loading and not others.  The size of my "E:\Cakewalk Content\Cakewalk Sample Data\Rapture Pro\..." folder as installed by "Rapture_Session_Setup_2.0.3.96" is only ~360MB.  But the combined size of all the expansion packs ("Session-Atmospheric-007", "Session-Guitars-007", "Session-Keys-007", "Session-Orchestral-007", and "Session-Synths-008") is ~3.7GB. So, evidently most of the samples were not installed. Bummer...
 

I know this thread is a little dated but I did not see the answer and I was just trying to accomplish this very same thing.  There is a registry hack that will accomplish this:  HKEY_LOCAL_MACHINE\SOFTWARE\Cakewalk Music Software\ContentDir.  The default was C:\Cakewalk Content.  I set mine to D:\Cakewalk Content and it worked.  Hope this helps.