i am wondering about the free users max parallel downloads options. I was thought that should look like that:
1. download ticket reserved (IP written to SQL database with state -> start/downloading)
2. perl script dl.pl/download.pl read and push the file to the user IP, after finish the script should change the SQL statement in database ( state -> closed)
The download1.html page script should read (check) the IP statement (downloading/fre) in the SQL database. If the IP don't downloading file it's free and can reserve the download ticket.
If the IP currently downloading the file download1.html page script should write: "Your IP currently downloading file.. bla bla bla"

It is possible to do it/add it to the 1.4 script ?
