My workload right now jam packed, I don't have any extra time to teach someone how to add forms in PHP. There are a ton of tutorials online that describe how to do it much better than I can.
To keep the upload files name, in func.php in the mapdb, line 148, change this:
PHP Code:
$name=time().".".get_ext($_FILES[$file]['name']);
to this:
PHP Code:
$name=$_FILES[$file]['name'];
But to be honest, you should look for another download database. I wrote this script many years ago, before I had any real knowledge of how to properly secure a PHP script.