how to put a sketch up file to another sketch up program?

i have sketchup pro. i build the convention center in tacloban and i am trying copy the building into sketch up8 or seven. on mac but it won't let me. i have to present in on mac because it's a school project and the school have mac laptop. i have windown. and i computer is not a laptop. so i can't take it to school. so i put the sketch up on my flash drive so that i could open it at school, but of course it would not open because they said i need "13.0.4812 mb".

but i can't find it anywhere. can i help me find it?

i want to download it. and my question is if i download sketch up 8 and i have sketch up pro would i be able to open the building that i built on sketch up 8?

and where can i download it ?

* thanks in advance.

thnks alot

*disclaimer : my project is due before christmass break .