Same problem here. I emailed Cakewalk a few days ago now with no response.
I installed Dim Pro when X1 came out...or before. But I no longer have any version on my machine. Nothing in my registry left.
So I go between "there is an older version on this machine" and "migrate to folder", where I have no dll's left at all. As far as I know, this is an install from scratch.
And I have a new serial number, so it should be a full, clean install.
I checked my user area for 1.2 or whatever to re-install, but the download option is not there for older versions.