Quoted from Bingovit:
Why would you like to play older code versions? There's a reason the older versions aren't available anymore
Archiving this type of information is very important for future generations of hackers - at some point in the future people will want to experiment with different code in this era machine, and having different versions to compare could help figure out things.
Yes, they end up being historical artifacts, but there's a reason as well that IPDB has all the released versions of software there - otherwise they could just have the latest posted and erase the rest.
Just as a 2000s era example - apparently there is a bug in the latest Monopoly release that's not in the earlier versions concerning dice rolling - so presumably someone could look at the equivalent code in the older version to see what changed vs. the latest version and possibly fix it.
Of course, someone at Stern could probably fix it in <20 minutes with the original source code, but that's not in their commercial interest right now.