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.
If so, that is horrible behaviour on their part.
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.