It's probably just paranoia, but I just didn't feel comfortable moving forward without seeing the finished installation screen, so I'm going ahead with a reinstall.
 
Thank you guys for all of your help with Melodyne though. Much obliged!
 
 
EDIT: As a small aside, Rapture's installation came after Melodyne's. So, of what I installed, Rapture processed last.

Yes it's always best to feel comfortable and knowledgeable.
 
Good luck with it.... Melodyne rocks once you get to know her.

Ok, I got everything reinstalled.
 
During Melodyne's installation, I selected only the 64-bit VST3 option. But afterward, I found that it had installed both a 64-bit and 32-bit version of "Melodyne singletrack.exe" on the computer (one in "Program Files/Celemony/" and one in "Program Files (x86)/Celemony/").
 
Seeing as I never intend to use the 32-bit version of the program, can I safely delete the .exe file in the "Program Files (x86)" folder without causing any problems in SONAR or with the other version? (There is only one "Melodyne singletrack" option in Windows' Programs and Features application, so I don't think I can uninstall just one or the other.)

I left it alone but doubt deleting the 32bit folder will affect anything. Whenever you are in doubt about deleting something, first rename or move the directory/file so that it cannot be found and see if everything works.

Good tip, scook. I'll do just that. Thanks again!