Click the link and then on the page that opens click the edit button and select use as template. From there you should then be able to download as PDF through canva.
Thanks!I've tried logging into Canva and then going to your link again but I'm still not getting an Edit option.I think you need to share a different link for use as a template or perhaps you need to publish it as a template.I'm not a regular Canva user so I don't know exactly what the solution is.