I don't think it would hurt to have the music available. I wasn't asked though. I did have the music with me just in case.
As long as it's legal, I don't see anything wrong with the internet music.
Of course, you create an impression with the music you bring. If you've got such-and-such edition and have a reason for it, that will look ok, esp if they agree with the edition choice.
And if they're old farts and don't know what the internet is, they might look down on the internet copies, regardless of the quality.
If I were you, I'd buy a standard paper edition and have it ready for the audition. Just by offering them the score, you show you're prepared for that day. If they ask why you picked that edition, have a reason ready. There are lots of recommendations for editions on here.
How much money is it really for the music compared with the option of deciding whether to attend that school once they offer? It's an easy thing to buy, that kind of security for the audition.