75511 Download script modifications

Looking for programmer to modify a download script. It's attached in this project. (1)2 download paths. The script only let you to define 1 download path only. I want to change it to 2. For example, if I call the script like: [login to view URL] the script will search the low version folder [login to view URL] the script will search the high version folder (2)The script currently require me to call the script like: [login to view URL] but I would like to change to [login to view URL], that means without file extension. and the script should search the file in the folder which match the name. (3)The script need to search some info in a remote mysql db to see if the download can be started or not (like username and password). But I have the experienced that, some cracker keep on to run the php script (so it continous to generate request to remote mysql db) and make the remote can't accept any request anymore. Is there any method to prevent this? I don't know whether the following mods is possible or not, just have a look: (4) Resume download. Since the file that is going to download is rather large. I would like to enable resume download (5)Allow those download manger software to download the file but hide the real url at the same time.