Yes, I can personally confirm that you can get the files from anywhere you want but you need to have a valid CD-Key to play after the 10 days trials.

I downloaded the wow installation files after a problem with my cd (from Blizzard's official website, not a warez) but copying it from someone's else computer works also, done it before as well.

What identify your account is the CD-Key and the online account linked to it, files on the computer are not important at all.

This post has been edited by Gormaz: Jul 21 2008, 02:17 PM