Do you know anyone else with the game, or can you convince one of your friends that they should buy it as well? If you can borrow, rent or otherwise get a hold of the game CDs long enough to install the game, then you can zip the entire Divine Divinity folder, back it up to a DVD-R or USB drive, and be able to reinstall whenever you wish by simply unzipping the archive. The DVD version would work, as well, but you would have to install the CD version patch so the game would look for your Play CD, rather than the DVD.
A remastered download version (see
here) is available from
GOG or
Impulse.