I've now found the UK, French, German, Italian and Spanish versions of the patch on some FTP site or other, so have downloaded them and will persuade the lovely JuliaSet to link 'em up in due course.
Edit:
This zip contains all the known C3 patches. Just extract the one that corresponds to your game version. c3up11.exe = USA version, the others are called c3up11 (version).exe