I find that whenever a new version comes out, I always tend to keep my copy of the old version. Not that I am planning on actually playing the old version, just, you know, to have it. So, since I've been playing KSP since .18, that means I have a lot of the old versions laying around. Using similar collecting logic, I tend to also get all three platforms whenever a new version comes out. All together, this means I have: 0.18.4 (W), 0.19.1 (W), 0.21.1 (W), 0.22.0 (L), 0.23.0 (W), 0.23.5 (W), 0.24.2 (W,M,L), 0.25.0 (W), 0.90.0 (W,M,L), 1.0.2 (w), 1.0.4 (W,M,L). The only one missing entirely is .20, and .22 is present in Linux flavor but not Windows. I usually wait around a while to download new versions so I usually end up with the last hotfix of a major version. Anybody else keep around their old versions? Anybody got a collection bigger than mine?