K-Lite Codec PAck V12.1.5 wants to install video Adblock for Chrome et Firefox.
Not detected by Unchecky
Here's the offer that I got while trying to install K-lite Codec Pack.
Unchecky showed a warning when I tried to accept it, as expected.
Perhaps you were seeing a different offer? Could you provide a screenshot?
And after decline propose to install Ad-Aware Web Companion...
Customer support service by UserEcho