You can run bootcamp/parallels, which is like running windows on your mac (even though the website says you can't do this, I think they said this to cover their end), but if you don't have that then you may be out of luck. You can try to get a copy of windows from someone and install it via bootcamp on your mac. Or borrow a friends laptop? Or get achiever. Topscore is probably nice, but I did fine without it 🙂