Hey There.
If i were you, i would definitely get my hands on ''other type of media'' and instal the game. Back, when original NFSMW came out, things were a bit differet than now, with games.
If You are owner of Original copy of MW, than you should have uniqe Serial code, or key. At the end of instalation, you will be required to enter it. This code is the proof, that you are the owner, not the **bleep** itself, or downloaded file. So game on!
