No, he's apparently already unrared the files, as he's got the ISO file. I don't know what the problem could be. It is possible, however unlikely, that your laptop indeed can't burn DL-DVDs. You may want to try and burn on someone else's computer.
Here's a guide anyway:
http://neosmart.net/wiki/display/G/Burning+ISO+Images+with+ImgBurn
@Spence: I'm glad to hear that, pal :-)