You asked for a Beta program, we're going one better. Following more than a year of research, architectural improvement and development, DARC are proud to present this DivX Pro? Plasma Alpha release.

Downloading Plasma
The DivX Pro Codec Plasma Alpha is available to all. You do not need a registered version of DivX Pro to use it. You do, however, first need to install some version of DivX 5.2.1

DivX Pro Plasma Codec Alpha

Thanks to SLO.ru :-)