I have the original GC2 that I bought in the UK, though because of *Enter bad excuse here* I haven't got any of the two expansion packs yet.

Now I wan't to buy them but since I won't be going to the UK again in the foreseeable future it's costly to get the UK expansion packs. I'm studying in Germany but am originally Dutch (Long Story). So it will be the easiest to get either of those versions. Now since I'm a bit 'old-fashioned' in the gaming sense I like to have the games on my shelf and don't really like digital downloads.

For my question; which version(s) is/are compatible with my UK GC2? (It's the collecter's edition, for if that makes a difference.)

Moreover, if digital download is the only way which can I use? Stardock/Steam?