Hi,
You can print your certificate to pdf file using web browser, for example Chrome running on windows. Below instructions are for Chrome:
First, navigate to your certificate in your profile using link below:
Click Print button on right hand side above your certificate
When your browser's print dialog is show, for Destination choose Save as PDF. Under More settings, uncheck Headers and footers, and check Background graphics, then click Save button and it will prompt you where to save the .pdf.
Please reply back with your results, whether positive or negative.
Thanks.
-TP