Nice work, egomassive!
The error message about running out of memory is not related to file size, or at least not directly. It comes up when a script wants to use more memory than the maximum allowed on that server.
I've been looking for this level forever, but I think the original links have expired.
If you run into a post with broken download links next time, could you please let staff know via the 'report to moderator' button on the post? We are actively keeping track of such links and ask the posters to fix them, or else.