We noticed that the invoices that are sent out to our attendees has an old company logo on it. In General Settings > Company Logo, I have already uploaded the new logo (at least 3 years ago). Where do I change the logo for the invoices?
That will have been set in the Invoice Payment method settings.
Event Espresso -> Payment Methods -> Invoice.
If the Invoice payment method itself isn’t active, enable it to view the settings and once updated you can disable it again.
Look for ‘Logo Image’.
Either assign the correct image there manually, or set the field to be empty and update the Invoice settings, EE will then use the image from General Settings.