I had a serial number for Sonar X3, but with the new account setup, Sonar X1/X2/X3 is not listed although other minor products are.  When I click on Download Now, the page says I'm not a Sonar X3 owner.  When the Sonar Platinum was first offered, I was entitled to an upgrade discount which my new account did not recognize.  When I clicked on Contact Support a few minutes ago, the link is invalid.  What now?
 
Cheers, John

Hi, John. I would contact the Bakers. They will get you sorted. I have all my products in "my products area" (even if I had lost my mail info for SONAR XL 2.2, and SONAR 4), and I did not register online until X3.
All the best.

Hi Ken.  Thanks for your help.  If you mean by Bakers, Tech Support, that is also a dead end as there is no record of me purchasing any Sonar X? product even though my account shows everything else.  As such, there isn't even a telephone number I can call.  Makes little sense to me.  Again, thanks.

Yes, the Bakers is just short for Cakewalk (in this case, Support).
If you still have your serial number, you could try to use this form http://www.cakewalk.com/Support/Knowledge-Base/2016000013/Products-Are-Missing-From-My-Cakewalk-Account 
Or contact them here http://www.cakewalk.com/Support/Email 
I think they will get you sorted.
All the best.