To upgrade Habari to the latest development snapshot, read this. Be mindful of the format changes mentioned in Upgrade Notes here.
Move your existing set of plug-ins (at user/plugins/) to user/plugins_prev/ for safe-keeping.
Issue the following command from a MySQL shell to deactivate all active plug-ins:
mysql> DELETE from habari__options WHERE name = "active_plugins";
To update the plug-ins, you will need to search Habari’s plug-ins index for replacement versions 0.7.x.y or trunk.