Hey there,

I am really sorry for the delay of this reply as it is a public holidays for us here.

The current latest version of Easydiscuss only compatible with Joomla 3.0 and above version, you should consider to upgrade your Joomla 2.5 site to 3.x .

You can read more our documentation about minimum system requirement.
https://stackideas.com/docs/easydiscuss/administrators/welcome/minimum-system-requirements