You should ask him if it's required.
Looking at what I assume is his website (looks very cheesy and unprofessional btw), the software part looks like it's just excel templates.
Now I'm going to make a few assumptions.
1. You're getting an MBA
2. Your professor wants you to buy pack K (the only one that costs $95 for students, all others apparently have a student discount).
Now Pack K is just Equity Analysis and FCF valuation templates. If you're an MBA student, it would be very beneficial for you to know how to build these financial models, in my experience it's the kind of stuff you get asked a lot on interviews, and is in on alot of job requirements for more finance specific stuff. In my personal opinion, neither Free Cash Flow or Equity models are that hard to build yourself in Excel (especially if you've taken other Accounting or Finance courses). Also you could easily find other free FCF or Equity templates online.
Also it apparently includes a case as well. Unless this is a unique case he developed (wouldn't put it past him), this may just be a case you can get for $3.95 from Harvard Business Review or for free somewhere else online.
So I would inquire about what it is your actually getting, and if you can pass the class without it.