Hey there -- I've had prior versions of PPRO coexist without issues on my systems. I don't see any problem with having PPRO CS 5 being simaltaneously installed with PPRO CS 6. Of course, backing up the system is always a good idea, we should be doing this routinely. Unistalling PPRO CS 5 will not cripple PPRO CS 6, after PPRO CS 6 is installed.
I have CS 4, 5, and 5.5 on my system.
I find it great to be able to go back if i need to.
There is no problem keeping them on. Just dont delete the old one after installing the new one since it does sometimes mess things up.
Also CS6 does NOT have OnLoaction so CS5.5 is the last version to have it if you use it.
I think Prelude took OnLocations place but there isnt any live capture.
I read somewhere in the OnLocation forun I think that Todd said that maybe some of the feature of OnLocation might merge into Prelude but dont know when or what will make it. I guess its just up to what features people are asking for.
Whenever I have installed a newer version of Adobe it has always taken over as the default when I double click.