Help with 1.3 update for Mac

[xxjaz1228]

Got no idea if it still works, but https://shelf.frictionalgames.com/ should be the place to go if you still have your credentials.

Otherwise I'll forward this off to our Community Manager and they'll be in contact

Thanks for replying super quick. I was able to put in the email and order number and it came up, and it does have the "download mac" option, but I'm wondering if this is to download the entire game application or if it will just download the update?? I'm afraid to do it in case if it's to download the whole game and something happens to all the data and stuff on my current game. Would you happen to know? 
Thanks a lot again