Pretty much exactly what it says - it found all my other CC products, but when I went to install a dreamweaver extension, it said "requires Dreamweaver 6 or later" and I was like "I have CC" - but then I looked in the "my products" column and everything EXCEPT Dreamweaver was listed. Any ideas?
EDIT - tried rebooting and reinstalling. did not help.
EDIT EDIT - it is Extension Manager CC and Dreamweaver CC - so they are the correct versions.
Found an older, solved thread, and while the "official" solution did not work for me, I began talking another contributor (Spenny) on the thread and he found the solution that worked for me - namely, logging out of CC in the main CC app, updating all my products, and re-logging in. You can see our discussion at Re: Adobe Extension Manager CC Problems.