The software will continue working after the 90-day trial, but you wont get any more updates after the 90-days unless you buy the licence, which, as Stuartli has stated, costs $29.95. So it's "free" (in the true sense of the word) for 90 days.
I have been using AWC2 Free Personal version for quite a time now. Very good product, and it doe's all that the programme states.
Having just downloaded the Pro version via link, it appears to mention expires 7th June 2007?. Another point that seems to have occurred. On installation, the programme commenced to do a restore point because it was first time use, then the restore point activity and pop-up message froze. Rebooted computer, and I will need to check later today, if installation and restore point was completed.