Unchecky can help here by unchecking all tickboxes in software installers, and warning you if you are about to install a PUP.
Unchecky automatically unticks checkboxes in software installers so you don't miss any
It might be worth seeking out a portable version of the software you want to use; by definition, portable programs don't have to be installed they are usually supplied in a ZIP archive , so won't include an installer with bundled add-ons.
If your antivirus software doesn't pick up the culprit, and you can't remove it through the browser's plug-ins menu, try Malwarebytes Anti-Malware.
Have you come across any particularly pernicious PUPs?
Let us know in the comments below!