Not really related to speedrun but maybe someone will be able to answer here. I tried for hours to find a way to launch the multiplayer exe with the beta patch that is supposed to allow 20 players but it just does not work i was receiving a memory error (don't remember the exact one), and even if it would the windows version run so slow compared to PS1 one. I can't even find a single video of the multiplayer on Youtube, did this multiplayer patch ever worked? Imagine if they fixed the game for newer systems on GOG i will buy it instantly.

https://destructionderby.fandom.com/wiki/Destruction_Derby_2#Multiplayer_patch

I've only ever seen it working on old systems, and even then I haven't seen it in quite some time

I'm with you on the GOG front, I'd pay good money for a proper fixed up DD2 port