urgent please help – checkout not working

hello i am hassling around since weeks trying to get this plugin to work for my customer.
i finally found that you have to use a special shipment class created by the plugin to kinda make it work.
but even if i choose ups shipment with our given flatrates – i cannot finnish the checkout process – i click, but nothing happens.
if i use another shipping option all works well.

please help it’s really urgent – i have a casenumber but the ups technicians don’t really support this plugin.
my client wants to send parcels but right now he has do transfer all his data by hand – this is not cool!

thanks and all my best
telemarker