I give more details of the problem:
The problem happens when I change the .htaccess
The names of the downloads are:
"Milenio% 203% 20 -% 20T9P28% 20 -% 2014-03-10% 20% 20 -% 20Proyecto% 20Dachau,% 20the% 20analizamos% 20resultados% 20 -% 20of% 20Mesa% 20redacci% C3% B3n.mp3"
it would be:
"Milenio 3 - T9P28 - 14-03-10 - Proyecto Dachau, analizamos los resultados - Mesa de redacción.mp3"
When I edit the .htaccess, downloads are renamed to "Milenio", simply delete everything after the space there.
I use the Wordpress version 2.9.2 and the latest version of your plugin. Except for the problem of the .htaccess, the plugin properly account downloads.
Thanks for your attention. Greetings.