When you click to download, it comes as a zip file not .tar
And as people mentioned before me, this is not version 1.1.5. It's version 1.1.3!
It needs to be version 1.1.7 to work on IPS 4.6.10 (and maybe on 4.6.11 too)
Anyways... I managed to correct the extension.
Please update the download page. recenttopics 1.1.3.tar
recenttopics 1.1.3.tar