There are two versions of the game on Amazon:

• http://www.amazon.co.uk/Empire-Homeworld-Cataclysm-Xplosiv-Range/dp/B000089Q3W/
• http://www.amazon.co.uk/Futre-Collection-Homeworld-Cataclysm-Cyberstorm/dp/B009AVAIH0

The copy I have is the Future War Collection. Regardless of the copy you purchase, you will need to download the 1.01 patch for your language version (you can find it just by searching "homeworlc cataclysm 1.01 patch" into google)