I apologize for the inconvenience.
Because the busy of the the last week to upgrade the site to new Joomla version with the latest PHP. So it seems the support staffs can't reply your email immediately.
To download your invoice, please click on "Download" button and click on your subscription plan to see the "Download Invoice" button.
One more thing, I can't track your order ID, so can you give me your order ID, so I can check and create an invoice for you more easily.