<https://invisioncommunity.com/forums/topic/417414-category-tabs-by-ips-themes/#comment-2592143>
<http://schema.org/text>
"If by old version you mean the version for IPB3 then yes as this is a complete re-build from scratch and sold as a separate product. It's untested with 4.1 as my theme upgrades are in progress at the moment I'm afraid. I'll test it for you tomorrow on 4.1 and let you know. (it 99.9% will work fine as AFAIK nothing changed between 4.0 -&gt; 4.1 in areas that this plugin uses :) )\n "
<https://invisioncommunity.com/forums/topic/417414-category-tabs-by-ips-themes/>