phranque - 5:46 am on Jun 19, 2010 (gmt 0)
so just to clarify your situation:
- /downloads/ is in the document root directory?
- the permissions for /downloads/ are 755?
- the permissions for /downloads/filename.zip are 644?
- there is nothing in .htaccess or /downloads/.htaccess that might restrict a request
- you have checked the server access/error logs for any further messages or clues?
perhaps there is something in the server configuration file in the context of that specific directory.