MSE, but I didn't get any warning from the AV; I just saw a new dialog for installing adware while installing K-Lite. After installing it, being careful to untick all pertinent boxes, I run AdwCleaner to see if something would have slipped into my system. Everything is normal.
And yes, it seems portable (or compressed without installer) is the way to go, until someone makes an util to modify installers to get rid of any bundled crap.