We have made a fix to Terms & Conditions feature after release 3.1 has been issued.
 
Please, download an updated version of the file from here:
http://www.viart.com/downloads/user_product-3.1.zip
Then extract file user_product.php into the root folder of your shop replacing the existing one.
 
 

You state to "Then extract file user_product.php into the 'admin' folder of your shop replacing the existing one."
 
I do not have a user_product.php in the admin folder. I do have one in root folder. Is that the one to replace, or is this a new module to be added to admin folder?

We've updated the message, thank you for your note.