Started with CWPA 6.0, moved to 9.0, jumped to Sonar 5.0 and then Sonar 8 all on CD (it is where I sit now).
My CWPA manual has a code for 5.0 handwritten in it (by me) so, I am guessing that when I bought it, Cake was just transitioning to 6.0 and I may have had a 5.0 disc (but maybe not).
Also, hand written on the 1st page is the tech support phone number ... and to this day, I can still recall the conversations that I had with Cake's tech support. Very specifically, a tech support person commented on how calm I was remaining and that most people in my situation (which apparently was quite common and had to do with deleted files) called to scream.