Battle.net allows you to download the installer. You don't need to play on Battle.net, just go on the website, register and download the installer. Then install using the cd-key you have.
Of course, provided you own a valid CD-key.
But, as I can tell from your original post, you do not own one and I'm basing my assumption on this:
I'm on a page about incorrect corrections, and spent the better part of like two hours trying to get someone to understand that -5^2 = -25, not 25, and then that post had comments get reposted because that group is self sustaining, and that person was in turn trying to explain what I just explained to them. And I'm taking that as a victory
I will be AFK for a couple of days you guys hold down the fort while I am gone. I will be checking in on my phone but that will severly limit me. Be back saturday!
I just got to watch the video because even though I was there I was trying to work out tech problems with the chat since I was the social media guy so I was distracted but check it out guys the video is super fucking great!