does not work, needs to be updated for Woo 2.1.2

Hi,
after installing your plugin, we encountered these issues:
– no emails are being sent for buyers
– impossible to checkout (clicking on “Place order” in checkout made the page load for hours and finally hang…)

Console shows “Failed to load resource: the server responded with a status of 500 (Internal Server Error)” https://[our domain]/wp-admin/admin-ajax.php?action=woocommerce_checkout

Mike Jolley said that this must be because we use old woocommerce version email templates overrides in our theme, but we do not. The only plugin we were using that is related to emails was yours, so we disabled it and the two problems I described earlier are gone.

So you should look through and update your plugin for Woocommerce 2.1.2

https://www.ads-software.com/plugins/woocommerce-pdf-invoices/