Thank you to
TIM3PORT at phpBB.com for submitting the following code changes, which will allow this MOD to function on the phpBB3 "proSilver" template.
Open
/styles/proSilver/template/viewtopic_body.html
in a text editor, such as Notepad, Wordpad, Notepad++, etc.
Find
<!-- IF postrow.POSTER_POSTS != '' --><dd><strong>{L_POSTS}:</strong>
{postrow.POSTER_POSTS}</dd><!-- ENDIF -->
Replace with
<!-- IF postrow.POSTER_POSTS != '' --><dd><strong>{L_POSTS}:</strong>
{postrow.POSTER_POSTS} ({postrow.POSTER_AVG_POSTS})</dd><!-- ENDIF -->
Save the file, and re-upload to server.