Model saved in 4.2 need to be saved in 4.1

hi friends!

i am trying a model of air and hydrogen mixing phenomena. i was using version 4.2 now i am using 4.1. The model i have, is saved in 4.2 i need it to be saved in 4.1 so that i can run it .

Anyone who want help me plz send his/her email address so that i can send the model.