kagakuninja,
I'm having the same issue. I have an iMac 3.2Ghz Intel Cor i3, 4GB RAM, running OS X v10.6.8.
Last night I ordered Logic Pro 9 from the Apple Store and started the download. It was going to take a while so I went to bed.
Next morning it was hung at 1.9GB of a 2.0GB download, so I canceled the download. I shut off the screen saver and energy savings options in Preferences and tried downloading again. And again. Then I started researching what was happening, and finally came across your post.
I guess the Logic Pro.app (about 443.5MB) goes online and starts downloading a 2.0GB file that contains "Basic Content".
I read that perhaps one of the files was corrupted, so I threw all the downloads in the Trash and went to the App Store to download again (3rd time). OOOPS! No longer does it say "Installed" --- it says $199.99. Yikes! And Logic Pro 9 is not listed as one of my purchases on iTunes or in the App Store.
I went to the email that Apple sent to confirm my purchase and tried to "Report a Problem" by clicking the link on the email. Failure again!. The "Report a Problem" button is entirely missing from the page that comes up in iTunes.
Got my fingers crossed this last download will work for me. I've been very satisfied with Apple until this event. Argghh! It's like Microsoft, but worse.