Where can I download my most recent statement / bill?

Here is the link to your most recent Invoice.
https://www.jotform.com/invoice?u=MaynardCooperGale&id=2018-03-24_12:25:18

You can check the invoices for your account in the Billing section (scroll down and click view next to Invoices).

https://www.jotform.com/myaccount/billing

Complete Guide: How to Check Invoices