What do I need to download???

If you're going to just play TA, you can ignore the Heightmaps (it's a package of pregenerated random planet terrains that saves some memory and load time in DL/DA, TA uses a new and better system).

The Tutorials module depends on if you want the Tutorial videos to be available in the game.

The Multimedia module contains all the game's audio, so that'll be an important one.

The Video module contains all the animated portraits and cutscenes in the game, so it'll also be fairly important.

Thanks for clearing it up. I'll play TA mostly because of the enhancements to the core mechanics. I'll give the older two a try too here and there. I'll dl tutorials, media and movies then.

I'm not sure about the heightmaps. If you say it saves memory, does that mean it does not give any additional content? My system has lots of memory (2GB of fast RAM) so I think I don't really need optimizations in the older two that I won't play that much. The heightmaps do not bring any content? So they can be left out if I don't want/need optimization???

I mean would I miss anything in DL/DA without the heightmaps or would I just waste some RAM and have longer load times - something I can easily handle - for the few times I'll play the older ones???

I hope you understand what I mean. I don't want to miss anything (like leaving out movies or so) but I can easily take longer load times in the older version that I may test some time.

I'm not really that much into story anyway. I love the sandbox games and TA is the best base for it.

Pretty much.