This is a Creative Cloud download. windows7, DWCS6
It produces the error code:
In file BusinessCatalyst init is not defined.
Aside: when this first happened I was able to launch DW by right clicking and selecting a particular, recent file.
I have tried to download DW again through Creative Cloud; it doesn't work that way.
After exhaustive research and being passed from BC, DW and MUSE technicians I finally said, "self, what would you normally do?"
With that I removed my current DW and downloaded a new one and all was well in the world again.