Note that the latest definition file for 2007\2008 and Anniversary editions can be downloaded here. This is left online as a service to those running the last old version, but you should consider upgrading to a newer product.
To install, unzip into your Ad-aware and restart the program. Ad-Aware includes a web updater, so downloading this manually is optional.
Once downloaded, simply unzip the contents into your Ad-Aware folder, (Most likely "C:\Program Files\Lavasoft\Ad-Aware SE Personal\"), the program will do the rest.

Your copy of Ad-Aware is completely free!
A Plus version is available for immediate download for $26.95 which features real-time monitoring and blocking for your system. Not only can you remove privacy threats from your computing environment, you can also BLOCK them from invading your system in the first place!