Hi romain1985, I don't think there's anything special you have to do...
The installer is not protected, right? There are no files with the same name on the three CD's, right?
In that case, I'd just copy the three CD-ful of data into the same directory, add the no-CD patch to it and then burn the whole thing onto a DVD. (_If_ I had UT2003 and a DVD-burner, that is.

)
But why don't you try this with your burner program set to write into an image file and then test it with Daemon Tools, without risking burning an unusable DVD? Good luck anyway,
Joe
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