I've noticed in Support that a fair number of people who are trying to get an invitation code get really confused about the presence of the source code on the site. I've seen requests from several users who say they downloaded the code but can't open it, etc.
Would it be possible to put a note/conspicuous announcement on the Code page, warning people that this code has nothing to do with invitation codes? Something like:
NOTE: This is not the invitation code needed to create a Free Account! For information on creating account, go here.