You're right, I can't edit history. This is also a very new account (think only about 2 weeks old). You really think accounts here mean anything? I've made about 10 over the space of 5-6 years, and I'm going to make another one after this post so you'll never know it's me in a future conversation.
And since posts can't be edited, here's something I found out - turns out I didn't even need to download the 7 or so GB of a HotS ISO - those idiots at Blizzard updated everyone to the latest version with the campaign included regardless. All you have to do is download the initial map save file located here:
save it in the appropriate place then restart with the appropriate difficulty. It's amazing how well it works!