I have an existing installation of SONAR and Dim Pro on a Windows 10 laptop.  I hadn't started SONAR on this machine since Gibson pulled the plug.  I'm finding that the Dim Pro instances are silent and are wanting the reg code.  When I put in the correct reg code I get...
 
Error
Invalid registration code. Please make sure to enter the product registration code exactly as you received it from Cakewalk.
 
I've tried entering by cut and paste and typing it directly.  Is there a work around?
I've collected a number of Dim Pro serial numbers and reg codes over the years.  Should I try those?

Any v1.5 credentials should work as long as SONAR or the stand alone synth is run as administrator while activating DPro.

Other serial number reg combinations don't want to work.  I've even tried 1.1 serial numbers and reg codes.  I'd hate to have to restart installation from scratch...since, as far as I know...you can't just install 1.5.  You have to start with 1.1.

You have to use the credentials associated with the version installed.
Version 1.5 serial numbers start with CWDM150.
Version 1.1 serial numbers start with CWDM110.
 
It is not clear which version of DPro or SONAR are involved.
 
DPro v1.5 shipped with X1 and newer. There was no requirement to install older versions of DPro unless there is a need for the DXi.
 
All version require running as administrator to register unless installed and activated using the Command Center with the DPro 1.1.5.16 installer.

Hmm...lemme try reinstalling with the CCC.  Part of the problem is that I have a number of legacy projects that used the DXi version.