I keep everything. I men they do not take up too much space. If you do not have space for a small box it's time to move....I have them all. CWPA 9 is the oldest I have, cannot find the 2 I had before that. But I have all the Sonars except the one time I didn't upgrade, It was Sonar 2 maybe, well whichever one came with Vsampler. I also have all the downloads that weren't on disk.
Ahh, LIveSynth Pro--- I used the hell out of that app...............
I really don't keep other types, just the CW\Sonar stuff.