At least for Pillars they don't. Only the latest version is there. Some games used to have all the version history but they might have removed it (understandable, as it is cumbersome if you just want to download and play) I might have the older version somewhere so it's a matter of finding it.
Hi K_A_T, thanks for chiming in. I actually tried Eternity Keeper and it didn't recognize the files so I assume I need to convert them to the newer version.