Hi Neil!
There is not any way out-of-the-box to schedule follow-up emails with Event Tickets Plus, but you might try using a different third-party plugin in the meantime. I found this list of email add-ons from WooCommerce – one option might be to go with something like the free Mailchimp extension, then add the ticket buyers to a specific list and schedule your email for that list within Mailchimp. I also found this one, which looks very similar to WooCommerce Follow Up Emails.
You could alternatively do a customization to resend the initial ticket email a week before the event – our themer’s guide is the place to start if you’d like to give this a shot!
If you need to grab the email addresses and send the email manually, you can do this at anytime by exporting the attendee list.
I hope this helps until WooCommerce Follow Up Emails is fixed! Please let me know if you have any questions.
Thanks,
Jennifer