I just packed adventure file and extra media together. No updates in adventure itself.
Windows XP: copy m3_ifrit.adv file to C:\Documents and Settings\All Users\Documents\The Witcher
Windows Vista/7: copy m3_ifrit.adv file to C:\Users\Public\Documents\The Witcher
Check additional folders for extra stuff:
- soundtrack - MP3 version
- walkthroughs in PDF