***** I already answered this message, but it was lost due to a server migration error *****
Horsy:
> First of all thank you for the great job you did.
Thanks for the comment.  
> Now my problem is that when I check the Allow 
> Zero Price checkbox, and do Continue.
> Then I still can't add a product with a zero price.
> And If I come back in the configuration panel the 
> Allow Zero Price Checkbox as been unchecked 
> but the other parameters are memorized.
> Do you have any clue? 
That is a bug introduced in version 0.1.1.251. I'm fixing it now. It will be included in the next version (to be released this week, I hope).
Regards,
Mario A. Valdez-Ramirez.