In 4.4.3 and up the terms have change. There are two changes that need to be made:
1.
http://www.alteredcart.com/support/knowledgebase/X-Cart-Modules/One-Page-Checkout/Using-X-Cart-4.4.3-and-g...nd-conditions/
2. A change is required to the skin/common_files/modules/Checkout_One/checkout_one.js file. I downloaded this from your server, changed this and attached it here. You will need to upload it to your server.