http://corecodec.org/project/showfil...release_id=123
This actually is the newest version - not sure if it's the same one bigds linked to, but the project is hosted at corecodec now so the corecodec download page is the place to get the latest one.
You also want the updated divx.dll package from:
http://pocketmvp.topcat.hu/
which should improve decoding speed, introduces support for the latest versions of xvid, and gives support for b-frames.