Really, there is no law breaking by someone sending you the install file. The law breaking occurs when you start to spread your activation key, which you purchased and agreed to keep to yourself.
I have NL installed onto my portable drive, and have my key code placed in a safe place on my drive as well, so essentially, I just plug it into any PC, open it up, input my key code and away I go. Nothing really happens to where I break the liscence agreement, as when I remove the drive, the key code gets removed from the sim untill I re-open it
It's a way I can take NL anywhere I go too