No Themes setting under Preferences --> Customization.

Make sure your SONAR about says:
22.5.0 BUILD 43
 

Okay, I figured it out.  Since I have 2 SSD's (C: @ 240GB and D: at 500GB), I initially installed Sonar to the D: drive.  I guess Command Center assumes C: when it does it's updates.  My shortcut was referencing the SONARPLT.exe on the D: drive and the latest build was on the C: drive.  I'll just have to make sure that the file locations point to C: with the exception of Cakewalk Content and Cakewalk Projects which point to my E: 2TB drive.  I really prefer the location to be D:, so I guess I have 2 options:
 
1. Copy (Overwrite) the folder structure from C:\Program Files\Cakewalk to D:\Program Files\Cakewalk or
2. Get a larger SSD drive for C:.  I like to keep the OS separate from the Programs and that's why I setup 2 physical SSD's.  Unfortunately, the path settings in Command Center point to D:\Program Files (x86)\Cakewalk\VstPlugins for the 32-bit VST's and D:\Program Files\Cakewalk\Vstplugins for the 64-bit VST's.  Now I have a real mess on my hands.

Or run the interactive installer in order to change the target path.
Yes the default will be to C:\Program Files.
 
To run the installer so you can change the installation folder, go into Command Center, settings (click the Gear) and on the Options tab, check off verbose install.  Then, during the course of the install, make sure to choose the advanced option, then you can specify whatever location you want.  Just be careful not to change the VST path in the installer since that's centrally set in the Command Center settings, Path tab. 
 
Keith