Many moons ago, I also kept the older versions; "Just to be sure". LOL.

I do not do that any more on my main Poser PC's.
But I have an older PC with "most" of the older versions.

It's been months that that one booted up. LOL, and for other reasons then Poser.
Mostly just to let him load all the Windows upgrades from time to time.

Poser 1, 2, 3, 4, 5, 7, P8 and PPro2010, P9 and PP2012, P10 and PP2014 Game Dev
"Do not drive faster then your angel can fly"!