Alpha2Product filter - doesnt work on my site

Hello, i've installed this interesting mod, installation seems to be ok.
Here : http://www.fantozzi.net/arredoshop/index.php?main_page=index&cPath=10_11
the problem : it doesn't filter. Maybe i've modified some files in the past and now i cant' figured why it doesn'y work.
Please could someone help me ??
Thank you in advance.
Francesco :no:

Hello, i've installed this interesting mod, installation seems to be ok.
Here : http://www.fantozzi.net/arredoshop/index.php?main_page=index&cPath=10_11
the problem : it doesn't filter. Maybe i've modified some files in the past and now i cant' figured why it doesn'y work.
Please could someone help me ??
Thank you in advance.
Francesco :no:

PS: i can't found any support thread for this mod .
Here the mod. : http://www.zen-cart.com/downloads.php?do=file&id=1164

The problem maybe is that alpha filter doesn't work at all ... and i don't know why.
Is there an alternative to this mod ?
I'm looking for something that do that :
add some "filter" to each category, display this filter in category, clicking filter search in description of product and display results.
Thanx again in advance