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I've been looking into this recently and it should be possible. When both the game and expansion are installed they take up 5.37gb. However, I see that regardless of which language you select during setup, language files for English, French, Spanish and Italian are all still installed with the game. The superfluous language files (everything except English for me) come to 1.44gb for the main game and 95mb for the expansion - I tried deleting those and without them the install size is just 3.83gb and the game still works perfectly.
So there should be some way of removing the language files that aren't needed from the installer's .cab files (and editing the install files as necessary) and then they should both fit onto a DVD5 easily.
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