If you are not activating DPro via the Command Center, run DPro either stand alone or in SONAR as administrator and enter the credentials for the synth. Make sure to use a recent set, pre v1.5 credentials will not work in v1.5.

Thanks Bit    I hadn't thought to ask @ Sony. I can give that a try since Magix is so slow at responding.
Michael

Thanks Maarkr. I still cannot open CDA 5.2. When I attempt to insert my serial number (which BTW worked/works on my old XP Pentium 4 PC)in the first window ( I assume that is activtation), I get the "error- invalid serial number" message. All 3 my Sony products are registered at both Sony and Magix with their original Sony serial numbers.
     I have posted on the Magix forum and a guy (rraud) has responded, but none of his suggestions has helped yet. Magix still has not responded to my 2nd support ticket.
     Magix did respond to my first support ticket, which was about my "CDA Trial expiration". I am deleting the licensing folder periodically to be able to insert the serial number. I even tried installing from my original CDA 5 disc, but get a message that "this app won't run on my PC". So, I've used the Magix download and/or the last Sony update for CDA 5.2
 
Michael

No problem, Wren. "Share the wealth" is my stance on forum use. It's not like I'll forget...LOL
 
 

Regarding CDA 5.2, I had a very similar issue as the OP when moving to a new computer, and could never get it resolved. I recall it also involved serial number changes from B5 to B6. This was long before Sony selling to Magix. I know that's not what you want to hear, but it was the sad reality at that time, so I switched to using the full version of Cakewalk's Pyro Audio Creator, which was still available then. I think you can only buy the LE version now.
 
Regarding Dim Pro, the problem may be related to confusion between multiple licenses if you purchased and installed Dim Pro separately prior to it being included as part of Sonar, starting with version 8. If you installed the one that came with Sonar, you now have two copies and they have separate licenses/registration codes. I ran into this problem too. I don't recall specifically what I did, but I think it may be as simple as using the right registration code for a given copy. Hope this helps.

Here's what I did to register mine... substitute your named CDA directory in place of my SLPro.  I think the key was to have the proper version for the license or it won't work (the license below was for my SLPro).  If it doesn't work, try a different version, prob the latest.  I may be able to find a link to a CDA version that may work with your license.
 
1/ Open the Windows registry (Win+R, regedit, ENTER) and go to :
HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Sony Creative Software\SpectraLayers Pro\3.0\License
2/ Delete the "License" folder.
3/ Make sure you have the latest version 3.0.29 or else it won't work.
4/ Once you made sure you have 3.0.29, try to register again.

YAY! Now you'll have to burn a CD for the car, just to have a souvenir of your CDA adventure. Every time you play it, you'll remember why you hate upgrading computers and swear to never do it again.

Thanks for bringing this here and getting it solved so we can do the same. Boom!

pentimentosound
 
Did you have any issues opening/running it? My issue was that I only had the CDA 5 serial number that came with my original purchase and though I updated years ago, I didn't get a new (required) serial, till Magix sent me one.
Michael

Nope, no issues with installing it or opening it as my Serial began with B6.  As I said, when I registered the Serial number with Magix, and they gave me the option do download the software and download the manual.  I was so shocked that they offered me the download files.  I purchased Sound Forge 8 back in 2005 and CD Architect 5.2(a) was bundled with it.
 
I tested the software and it worked just as it did when I purchased it initially many years ago.  I purchased CD Architect 5.2(a) and Sony Sound forge 8 at the same time, but now, there is no reason for my to attempt to install Sound forge 8.
 
I went into the software this morning, looked under the Help tab and selected the updates link. It took me back to the Magix page where I selected downloads.  I entered the Serial number I had for CD Architect 5.2(a) and I was presented with a download optiom for CD Architect 5.2 (ii). This downloadable file happened to be version 5.2(d) (Build 240) and it came with a new serial number, however, I didn't need to enter the serial number as I just installed the update over top of the version previously installed.   I guess if I uninstall the software and performed a new install with version(d), I would have needed the new serial number given along with the download.
 
I am not sure of the difference between Version (A) and (D), however,  I am great to have it, as version (d) is the latest version of the software.
 
Thanks for starting this post pentimentosound and I am glad you were able to resolve your problem as well.