PFD Embedder Homepage Not Accessible

PDF Embedder Homepage (at https://wp-pdf.com/downloads/pdf-embedder-secure/) is not accessible. It has been off and on for a while during the past month (or more) but now it is not accessible via google or directly, using any browser. This basically means premium/secure licensees (or anyone) cannot login to their accounts. Not only this is not acceptable and shows the staff do not have their acts together for some still unexplained reason, but for some reason they are limiting access to our accounts, on purpose or not. Is this plugin, especially its premium/secure version, still on the shelves, or without notice has been closed?

The page I need help with: [log in to see the link]