You can upgrade to the new version (we recommend doing this on dev sites) by manually updating the plugin.
It’s hard to say for sure, but it looks like the invoice image URL set for the invoice is pointing to an attachment page instead of an image URL. Can you verify that the invoice Logo URL is a URL that will display an image instead of an attachment page?
The support post ‘Download pdf Invoice-Error Message’ is closed to new replies.
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Support forum for Event Espresso 3 and Event Espresso 4.