Cant install the Avast browser plugins

When i first downloaded Avast it installed the browser plugins, which i have since deleted.

I now want to get them back so i opened avast, and went to Tool and tried to activate it, but nothing happened. Any ideas ? Does it have to be manually downloaded from the browsers app / extension store ?

OSX 10.10.5

https://forum.avast.com/index.php?board=5.0

http://screencast-o-matic.com/screenshots/u/Lh/1483468869264-73128.png

http://screencast-o-matic.com/screenshots/u/Lh/1483469219125-61185.png

Hi Bob, the OP is on a Mac. :wink: