Just give it a rest, alright? He honestly shouldn't take playing OpenBVE at school(or trying to log into the administrator's side of the computer) very seriously. OpenBVE, in my honest opinion, is a simulator meant for the personal computer.
The point is, check out the OpenBVE home page and see if there is a Mac version. If I remember correctly, there's a topic around these forums which shows you how to get OpenBVE on Mac.
BStyles