I had trouble with installing the 1.2 patch(German patch) for Battlefront 1. If i install it, a message appears: "Unknown error"(English) "Unbekannter Fehler"(German)
Since Unknown Errors are usually just mysterious, I would just try installing the patch again, if you haven't tried it multiple times already.
If that fails, try re-downloading the installer, and using your newer version. Perhaps there was an error with the first one in the download stage.
Alternatively, see about downloading a different installer, or downloading an installer from another website. Then try running the new installer.
If all else fails, re-install Star Wars Battlefront. (If you have any mods, be sure to back them up!) After re-installing Battlefront, try running your installer again.
Did u download it from uef website ? Cause my brother had the same prob...