I really don't know what to suggest... CS5 is from LONG before the Cloud, so this forum is not the right place, but I don't know if there is even a right place now
CS6 is 3 years old and no longer being updated, and CS5 is even older... so, as well as being on Windows, I have no idea what update could be "required" by your Mac
I have seen mention of Mac requiring a Java update for Yosemite, but you don't mention Java