they wrap my installer inside their installer which includes some sort of toolbar I am checking out before I finish installing it because I read some reports it is malware.
Ugh, that’s even more disgusting than I thought, and that kind of thing is like “stealing” — your reputation in this case. Good luck with dmca, possibly a trademark fraud case too, which could have actual financial consequences for them.
Vile beyond any stretch of reason. Here's hoping you find a valid way to "put them in their place" as it were… Wishing you the absolute best of luck handling/resolving this.