In order to change your billing details or download your invoices, please head on to:
Once there, enter your sale number, and the email address you used at registration, to identify yourself as an opensolr buyer.
You can find these details in your opensolr control panel billing page:
Once you're succesfully identified your order, go ahead and simply scroll down on that page, and click the link that says:
Update Billing Info
You'll also be able to see and download your invoices once there..