Small note: though DooM3 runs fine portably, it has problems updating on systems that it hasn't been installed on due to the patch installer's nature. I haven't had a chance to test out my theories, but there are small .ini files written to C:\Windows and they may have something to do with it, but nonetheless I got a regshot of the entire installation procedure and I'll probably end up investigating that when the next update comes along.
your theories is right, but that's if you want to update. I think you can still play the game without updating right?
I have portable Doom 3 Multiplayer (the singleplayer menu won't work, hehehe
), it's work like a charm, no crash whatsoever, but still contains alot of missing textures and sounds (dunno how to figure out which files is needed or not)... and it's about 400 to 500+ MB in size if the files are packed in .PK4 and around 800+ MB if unpacked...