I'm trying to find system shock 2's version 2.03 update and I cant find it, is there any website with a list of patches and updates to download for retro games like system shock and others?
This is probably your best bet for old game patches: https://www.patches-scrolls.de/
Not sure if they have that particular System Shock 2 patch, but it's worth a look. For other games, the PC Gaming Wiki sometimes has mirrors of the original patches. However, they seem to mostly focus on fan made fixes, which allow games to run on modern systems.
When those fail, try searching through the magazine cover CDs on archive dot org. May take some effort though - "small fry" like patches often isn't listed in the upload description but if there's a cover scan there's a good change it's shown there. Or in some cases you can guess the file name (e.g. from earlier or later patches) and search that.
There'd been only one patch and it's v2.3 (no 0).
you'll quite often find dead links to patches, but as long as you can find the filename google is still your friend
For System Shock 2, don't use the official patch. Instead go here:
https://www.systemshock.org/index.php?topic=4447.0
It's a fan site/forum/file download site for System Shock 1 and 2,and you should follow the instructions on that webpage. It includes SS2Tool, which automatically installs all needed patches, and SCP (Shock Community Patch, an optional but very recommended all-in-one comprehensive collection of fan-made fixes, balances, and improvements, involving literally thousands of things in the game.
Seriously, don't play the game with just the official patch, instead set up the game using the downloads on that webpage. It really is by far the best way to play this superb game.
