Lavasoft Ad-Aware has been useful to me for many years. The current upgrade is Ad-Aware Anniversary Edition / AAW AE / AAW8 which became available on the 20th of January. I find that it does not work well on one of my Windows 2000 machines on which I also run Spybot S&D Tea Timer. I'm not going to go into details. On the other hand I believe that most AAW users are doing well with the upgrade. My problems likely relate to the fact that I'm not willing to give up Spybot S&D Tea Timer.
So I reinstalled the version I upgraded to 45 days ago. That version works well for me.
A few days before AAW AE (AAW8) was released the folks at Lavasoft released an update to AAW 2008 (AAW7). AAW7 went from 18.104.22.168 to 22.214.171.124.
I strongly suspect that the sole change involved with 126.96.36.199 was a "pop-up" screen that asks the proverbial question "Are You Going To Upgrade To AAW AE Today? Or Are You Going To Wait Until Tomorrow?" That pop-up can be silenced with the procedure below.
How to go back to AAW version 188.8.131.52 specifically
You can get Ad-Aware 2008 184.108.40.206 (AAW7) from any of these download websites:
filehippo.com / download.com / brothersoft.com / softpedia.com
fileforum.betanews.com / majorgeeks.com / asia.cnet.com
downloads.zdnet.com / zdnet.com.au / downloads.zdnet.co.uk
The copy of aaw2008.exe that I got on December 4th, 2008 has an MD5 of b91a4536c67c24db4b87b007e4ebe730.
There is probably some way to get it from the Lavasoft website but as you search for it there they push you towards AAW8.
Uninstall AAW8. If you have 220.127.116.11 installed then uninstall that version.
Disconnect from the internet.
Install AAW 18.104.22.168 (run aaw2008.exe). It will attempt to connect to the Lavasoft mother ship and will time out. The install will complete.
Reconnect to the internet.
You might want to exit and then restart AAW7 at this point. I don't think that that is necessary, but it couldn't hurt.
In the main window click the Update button. Any definitions updates that are available will come down. It will display a window that says "There are new software updates available! Would you like to go to the download location?" Click no. If you click yes you will be upgraded to 22.214.171.124 .
The install is complete.
Each time you update your definitions it will ask you about software updates. You need to click no each time. KEEP IN MIND THAT, SOONER OR LATER, AAW 126.96.36.199 WILL NO LONGER BE SUPPORTED.
Keep aaw2008.exe somewhere so you can revert back to it if necessary.