Shove junk that I don't want into your downloads?
I stop using your software.
At BEST, I remove the junk and keep a "clean" version someone on my network that I only ever use to install from (i.e. you not only lose your paid-for junk, but quite likely any future updates, and I'll start looking for alternatives).
It's things like this that force me to move towards software where I have a choice. I'm not a GNU/FSF fan at all, but to me open-software does precisely what I need to do and nothing more, especially where installation is concerned.
Don't even get me started on the places that take freeware like Irfanview and "bundle" it for no reason (surely against the EULA of a lot of this software, if it isn't and it was my software, it most certainly would be very quickly).
Honestly, a great way to turn off your customers. And you know what, a ZIP utility installing a browser toolbar is NOT something that ANYONE actually wants. Stop it. I'm looking at you IZArc, that I recommended and used personally for years until you started that nonsense.
And why do I get annoyed? Precisely because I want you doing NOTHING MORE than you absolutely need to do to do the job, because of problems like this. Especially when you want to insert yourself into my web-browsing path, redirect my searches, even change my proxy to something third-party. It's a massive security issue, even if things aren't written by a technically incompetent programmer, or maliciously intended.