Hier ist die Antwort die ich heute Nacht von Google bekommen habe und hoffe sie hilft Euch weiter.
Dear Günter,
Thank you for contacting Nik by Google. Provided you have the Nik Collection installed, you can simply download the demo from http://www.google.com/nikcollection. When you download the demo, it will see your previously registered version, and install the full version that includes Analog Efex Pro.
If you have any further questions, please reply to this email or visit support.google.com/nikcollection to call our Customer Service Department Monday through Friday 8:30 am to 5:00 pm PST.
Best Regards,Navah___________________Nik by Google, Inc. | Photography first®
To learn more about our award winning Nik Collection, please visit http://www.google.com/nikcollection and click on the Support tab for online lessons, videos, and blog posts on Google+.