We check this website, now pdfpro.co is up and dont blocked for our system and other users of the Internet.
So, answer to question: Is pdfpro Down Right Now? - NO! pdfpro is up!
If you have problem with access to site pdfpro, and domain pdfpro.co is not avalible.
Clear browser cache and/or try other web browser
(Chrome, Firefox or Safari).