j1clark@ucsd.edu
Veteran
You can install them both on the same system, no need to leave anything behind. Install cs6 and leave cs5.5 there as your security blanket to switch back to if you hate the upgrade.
A couple of points... I started this thread because I had wyrd problems with the 'upgrade' feature on my Mac OS X 10.8.2 using any of the suggested methods, Adobe App Manager, manual download of updates, and install, etc...
I've seen a number of similar symptoms reported by others on the Adobe site, so I think there is just 'something wrong' with the way that the update utility 'cleans house'. The reason why I say 'clean house' is one person reported update symptoms similar to mine, and through a series of attempts to 'fix the problem', eventually just cleared everything off his /Library and ~/Library folders of everything that had 'adobe' in the path name. (Not a procedure for the faint of heart...). And lo and behold, he had success in updating packages that had previously given update errors...
I have a CS5 install as well as a CS4... and I suspect given that person's experience, that perhaps by doing the 'real clean' operation, I may over come my difficulties...
That all said... once the programs have been in stalled, and they are 'working' I have had very little trouble with them. I did have a problem with Premiere that did kick off this whole exercise and again with a 'cleaned up' directory that problem disappeared...
The guess that I have at the moment is that Adobe has a problem in the area of 'cleaning up' when installing new software or updates, and does not do a good job at finding and eliminating those files that may cause the new software problems.
So, since I have a backup machine I will probably go through the process mentioned above and blast everything 'adobe' in to oblivion, and then do an install on a squeaky clean system, well relative to Adobe...