New in 3.1.3: Invoice templates:
With this cool new feature you can modify your PDF & HTML invoices layout using built-in editor. No programming skills required & no more file edits! – just add/remove contents, edit look & feel – all from HostBill interface. Learn more at: https://hostbill.atlassian.net/wiki/spaces/DOCS/pages/370278450/Document+templates

Full changelog:
hostbillapp.com/changelog/

Install/upgrade:
https://hostbill.atlassian.net/wiki/spaces/DOCS/pages/491526/HostBill+Install+Upgrade