I ran into this frustrating problem and had equal luck Googling for a solution. When I tried the possible solution to sign out of CC and install DC Pro independent of CC I ran into an installation issue which complained more specifically about being unable to install/start the print spooler, which I had disabled since I do not have a home printer and was at one time grasping at straws to increase my boot speed. This made me think that the same problem was causing the CC install to fail, though its complaint was less specific. So... I logged back on to CC after first setting the print spooler service to Manual and... success!!! DC installed without issue. One would think that the CC developers could at least be a little more precise when their install fails. The standard installer certainly had the brains to figure it out, though why something as simple as a disabled print spooler should cause a fatal install error is a mystery to me.
I really hope this solves the problem for some others out there. This was frustrating me for some time and believe me when I say "I feel your pain". Good luck.