It's online available here: https://www.moddb.com/games/system-shock/downloads/high-resolution-object-textures-v30 .

(I removed the beta attachment from my previous post)

Bumping this as I have been playing SS1EE a lot recently, your mod is really great, I'm curious if it can be extended to other things?
Most of the environment textures surpringly still look great to be honest, but some of them like animated doors, animated screens (not cameras), paintings, and 2D props pales in comparision. Enemies could really benefit from it too, even if it is not advanced AI upscaling, just the regular one could help tremendously. There's also the status mini cutscenes that look incredibly low res unfortunately (the ones when you see citadel station at some occasions after doing some quests).

Be careful though as secret doors would still need to be low res on purpose hehe.

How did you get access to the game's textures?