I just replied in one of his other threads. This is an open and shut issue. Upgrade or buy something else.

maybe im different in thinking that,
if I couldn't get Windows XP to install correctly, I surely wouldn't contact Microsoft asking them to help.
And I also wouldn't make multi posts on Microsoft forums about lack of support.
 
You are using a version of Sonar that is 6 versions old. only my opinion but I am guessing they are ignoring your posts because support for your product expired years ago.
 
However, you always have this forum to ask questions. a lot of us here will generously offer our time to help you. 
 

FWIW, you can still buy a copy of Sonar 8 Producer Edition on eBay for under $30.

telecharge
FWIW, you can still buy a copy of Sonar 8 Producer Edition on eBay for under $30.

So what?

bobsacco
Mike Lally in customer support wrote me an email telling me that he "manually placed your SONAR 8 registration into your new account".
 
Ever since then, my SONAR program will NOT register.

Seems pretty simple, really. I read the OP's situation thusly - Two months ago, through contact with Cakewalk tech support, a Cakewalk support employee did something with the OP's registration that appears to have resulted in the OP no longer being able to register his software. This throws out of the window the posted retorts inferring that the product is too old to support. Someone at Cakewalk apparently disagreed with that point of view. When the OP used the "moved" registration info to register his product, the registration info did not work. So, naturally, the OP contacted the same support network that moved his registration information to find out why the moved registration info does not work. To date, he has received no reply.
Now, maybe I'm wrong in my assessment, but it doesn't appear I am. If I'm not, I completely understand his frustration. If Cake's tech support did something that appears to have rendered his software unusable, it only seems fair that they would at least look into the situation, no matter how old the product. If Cake Tech had done nothing with his registration info and his account, and the software just stopped working, I could easily understand the "tough luck" posts. But, it appears, that's not the case.
 
Good luck Bob. 

Looking at the previous threads, the first one started a month ago regarding installation followed by others regarding registration etc. In none of them can I see the logical steps of what the OP has actually done.
From what I am guessing, the software was registered previously with the original serial number and therefore trying to re-register it with the same serial has thrown the already registered error. I am assuming based on the threads, that someone from CW sorted out a serial number and dropped into the SSO user account area. I am then assuming that the OP then attempted to use the new serial from the account area to register and it still failed. If not and the OP is still trying to use the original serial I can guess why it is a problem.  I can't see anywhere where this has been confirmed so am not sure. This is separate to the other questions i.e. Does Sonar 8 run on Win 7?  If there is a pressing need to import the old projects is there another way to do it? Having a valid serial for 8 in the account area, is there an upgrade path to the latest version?
I guess we can assist in some ways but it is difficult without understanding the logical timeline but if the first post was in August it is not 2 months, unless the OP was struggling with this for a month before trying the forums for assistance.

I assume someone suggested the OP run the program with Administrative privileges to authorise the program as would be required under Windows 7.

If I remember correctly, with Sonar 8 you only had to fill in your serial in Sonar and the program worked.
Am I mistaken?

coolbass
If I remember correctly, with Sonar 8 you only had to fill in your serial in Sonar and the program worked.
Am I mistaken?

IIRC, there was also an activation code...

coolbass
If I remember correctly, with Sonar 8 you only had to fill in your serial in Sonar and the program worked.
Am I mistaken?

Serial number and registration number.