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First of all, thank you for this amazing plugin. It is one of the best plugins available, free or otherwise.
A recent update to Jetpack broke the ability to download an invoice. Reverting to Jetpack 12.5 fixes the problem.
The Jetpack team has investigated, and said:
This issue seems to be coming from PDF Invoices & Packing Slips for WooCommerce Plugin encoding the url too early which causes it to break.
For now, we will push a fix that accounts for that but a fix must come from PDF Invoices & Packing Slips for WooCommerce as well.
So, I am forwarding this information here, in the event that the PDF Invoices & Packing Slips plugin needs to be updated.