This doesn't answer Greg's question which I wouldn't even attempt to advise on which to keep or not, I like Mr Bosco suggestion about a museum.
I have all my apps from cc saved onto an external USB drive they all right from the very beginning, all version releases. (Right from RLM upto the latest version of SD4 for example)
They are not installed just there ready to use if required.
The latest versions are installed onto my PC for use.
If I need work on an earlier version of any of those apps I load it up onto a second pc dedicated just for that purpose.
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