Cheeky. Some people need to put a sock in their mouth. Tell him/her to buy it instead or shut up.

A good "fuck off" would suffice.

Ask them for a daily knuckle sandwich in return. They can afford it.

Not sure if this post is against the rules or not. If it is just remove it. But I recommend downloading the thirty day free trial of Adobe Premiere. It's simple to use, and gives really good results. The software you have on a standard PC is shit. It won't ask you to install a $130 program either. It's what I use as a filmmaker.

Perhaps they should buy it and use it to edit their personality, instead?

I hate when people are judgmental out of nowhere. I'd pull them aside later and ask them to not say things like that especially in front of other group members.

And this is why this craze for group work has gone too far! Your grade depends far too much on the assholes you get paired with!

That's sucky op. Unfortunately you likely will have to work with others in real life, so school/college is trying to train you to work in a group. Learning how to deal with "leeches" is all part of the process. In both school and the workplace, ensure that your higher-up knows that you've done the majority of the work, and a fair boss/teacher will often reward as such. Good luck with the project

I'd go "Oh really? That's funny because you look like you could use some meat on them bones so how 'bout you BITE ME, YOU FUCKIN' ASSHOLE! *flips them the bird with both hands*" Judgemental douchnozzles seriously piss me off :|

In OP's shoes, I would inform them that, unless they front some of the money for the program, they can fully expect me to go to the instructor over their behavior. ESPECIALLY since they are also expecting OP to do the actual editing in addition to fronting the entire cost of the program for their benefit. HR exists for a reason in companies, and the Professor (and college, if the Professor fails to take the matter seriously) is obligated to take on that role if their reasoning behind the group project is to simulate a "natural" work environment. Alternatively, if possible, ignore the program's request for you to buy a different program, and continue using it or download a different free program. Regardless of what other actions OP takes, I would suggest that, if their verbal bullying continues, that they speak to the Professor in private about their inappropriate behavior putting a strain on the working relationship of the group.