It's not too late to register until you check that FontYa works O.K. in your system. That will prevent you from possible loss. Refund is very difficult for small money.
User manual is in HTML format and included in download file.
You will get the bank account number. Currently,it is only available to transfer registration fee through bank directly. When you don't get reply from me, please resend e-mail to check. You will receive userID with registration number. It's neccessary to get update version.