As the Joomla team has stopped support for the Joomla 1.0 series and since the CB team has also found security issues and called for everyone to upgrade to cb 1.2.1 it is not likely that you will find much help in finding an instance of GroupJive that is compatible with these older versions of Joomla and CB.
It may be best in the long run for you to think about migrating and upgrading, although I know how difficult migrating an existing site can be.
Best of luck.
www.groupjive.org is the best place to look for any downloads either in forum attachments or in their download section.