Hi Volker,
Have you tried downloading from a different browser?
Download Photoshop elements 13 : http://trials3.adobe.com/AdobeProducts/PSE/13/osx10/PhotoshopElements_13_WWEFDJ.dmg
Download Premiere elements 13 : http://trials3.adobe.com/AdobeProducts/PRE/13/osx10/PremiereElements_13_WWEFDJ.dmg
Regards,
Rahul.