I don't really know what you have gone through to get to where you are now - sorry for whatever suffering and setbacks you have endured.
I have my Paths set in Cakewalk Command Center to download installers to one folder that lives on a different drive than my C:, and it also downloads Cakewalk Content to a location on that same alternative drive, so that only things that default to being placed in my AppData or the ProgramData folders are still being loaded to the C:, which for me is a 110 GB solid-state drive.
The libraries for Rapture and Dimension Pro, as well as Rapture Pro, for me - are also moved off the C:, so at the end of it all, I have over 50 GB of free space still there on my C:, out of the 110 GB starting size.
There is also the Verbose Install option in Command Center, which I understand launches the traditional, or at least more traditional, install path for a given Cakewalk component being installed through Command Center.
So, I am a bit unsure of what you have done or not done to have a bunch of content taking over your C:, and am wondering if some review of that would assist in helping you to move things away from that drive.
I am also quite curious as to what NI plugin you had/have so much trouble with - as I too am quite invested in NI software. Please consider explaining that situation so I can better evaluate where I am with NI.
THANKS,
Bob Bone
Bob Bone