Thanks to all who replied!
I ran the cakewalk.exe file and it installed the new BandLab Cakewalk program just fine.
Thanks also for the tip about not needing to run the instruments.exe file, as I have all the instruments that have been bundled with the various versions of Sonar, X1, X2, X3, Platinum etc. that I have installed in the past.
After the installation succeeded, I loaded and listened to some Sonar projects and other than noticing a slight timing jitter on first play (that disappeared on subsequent plays), everything sounded as it should.
I'm really happy that BandLab didn't let this wonderful program die as it really is great DAW program and there is just so much hard work and creativity by the Bakers that has made it what it is.
Thanks again bitflipper, fitzj, and jaun47!
Nick