I've got 3 internal non-OS drives - R: Recording; S: Samples (Kontakt);  T: Samples (Other)
 
I recently changed my Samples (Other) drive letter from F: to T: and thought nothing of it until I went to retrieve the 30th Anniversary Rapture Expansion Pack.  Upon install I get this error but no option to change path.  I also could not find an option in Rapture Pro to designate a samples path.
 
I did a quick forum and Rapture Help Documentation search but came up empty.  Any suggestions would be appreciated.

I believe that RPro reads HKEY_LOCAL_MACHINE\SOFTWARE\Cakewalk Music Software using ContentDir as the parent directory for the "Rapture Pro" folder and "SampleDataDir" as the parent directory for the "Cakewalk Sample Data" folder.
 
The "Rapture Pro" folder contains EQ, Elements, Logs, MIDI, Programs, Sample Pool and SQ folders. It also contains some xml files in the root for program management.
 
The "Cakewalk Sample Data" folder contains a "Rapture Pro" folder. In this "Rapture Pro" folder are the LFo Waveforms, Multisamples and Tunigs folders.
 
 
 

Sorry for the delayed reply!  Found the entries in the registry designating the old drive letter and successfully changed to the new.  Samples now load and I was able to load the 30th Anniversary Rapture Expansion Pack.
 
Thanks Steve!!