Problem mit Mathcad-Download trotz erweitertem Downloadservice

Hello. I bought the product on 4th of January with a "erweiterten Downloadservice". Now 1 wanted to install MAthcad, but I cannot open the site http://www.findmyorder.com/de. I tried it serveral times but it didn't work. Therefore I couldn't download Mathcad. Can you please help me? I also didn't find another way to login on the ptc website.