If you log into your account on the Cakewalk web site you can download everything manually that you would download from the Command Center. Although, if you have kept the contents of the folder that Command Center stores its downloads in, you may already have everything in there, and those installers can also be run manually.
The real issue will be attempting to activate things at some point in the future if the servers are shut down. To solve that problem would require some kind of permanent unlock patch from Cakewalk, which we are all hoping they will provide at some point.