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The server has PHP 5 and MySql 4.1 (I think it's 4.1).
I copied the sql table directly from the other server so it should work the same, and I copied the module files directly too. What's really weird is that if I set it so anonymous users can access the download module, it works. What do you mean by debug modes? There aren't any PHP errors on the page, so I'm assuming you meant that :/
And I would consider another module if I didn't have like 400+ files in the downloads section. I also wouldn't want an upload feature; I'm dealing with big files and upload them via FTP to my server and then link to them.