If the patterns are still in your shopping basket then the purchase process is not yet finished. For technical reasons, you must "buy" the pattern even if it is free. The process is thus exactly the same as if you were purchasing an item: click on ‘continue to payment’ and follow the usual steps. Obviously you will not be asked to provide payment details in the end, and therefore you will not be charged for anything.
If you're still having issues then don't hesitate to write us a message here and we'll make sure to respond with a solution as quickly as possible!