First  please make sure, that you are not on a localhost AND do not have any .htaccess / .passwd on your sever. Because our plugin uses HTTP to get the images for the PDF creation and if your server blocks the images from public it won’t work.

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Please make sure you have installed / configured the following in your Server PHP Extensions:

1. CURL Enabled (php_curl.dll enabled)
2. PHP.ini (allow_url_fopen = On)
3. GD Library installed