It's quite possible that VN stands for Vin Number, and is generated and/or modified as part of the update process. So copying someone else's VN.txt file might not be a good idea.
Then again, if you are somehow sure that you have the right download for your VIN, it might be possible to use a text editor to change it to say "pass" (but what case, are there any hidden characters, etc). In that case, copying someone else's file might save a lot of downloading.
But how can you be sure that you have the exact right download for your exact model?