Instructions:
Admin Cp-> Appearance-> Templates-> Edit Templates->header->
Note :- Paste the code at the top changing "X" to your banned usergroup ID and
replace http://www.url-you-w...to-redirect.com with the url you wanna send them to.
Admin Cp-> Appearance-> Templates-> Edit Templates->header->
PHP:
<if condition="$bbuserinfo['userid'] == X">
<meta HTTP-EQUIV="REFRESH" content="0; url=http://www.url-you-want-to-redirect.com">
</if>
Note :- Paste the code at the top changing "X" to your banned usergroup ID and
replace http://www.url-you-w...to-redirect.com with the url you wanna send them to.