Can´t install the extension

hi
I have tried this scheduler before and it like me, now I´m working with joomla 3.3 I downloaded the extension but couldn´t install it (JInstaller: :Instalación: No puede encontrar el archivo XML de instalación de Joomla) I not sure if is a error with the files or is because of the version of joomla
wait for your reply
thanks

Hi,

I have the same issue trying to install in joomla 3.3, Please can support assist with this.

Regards
Dave