Sorry about the missing search function; Google recently retired the custom search integration method we'd been using for our site search, so we had to remove that temporarily until we build a new search integration using Google's latest method. You'll see a spyglass icon reappear at the top of our site when that's ready.
"Sorry, this transaction can not be renewed any more" means that you've either deleted one of the products in that order or already reactivated the link 5 times (the max. our system allows). You can use "Send free download link" to issue the buyer a replacement link.