We are aware of an issue that occurred during the first 24 hours of this offer being live, where registration of the plug-in was failing for a small number of customers.
This issue has now been resolved, so please follow the steps below to rectify this issue.
1) Please log in to your Zplane account at https://products.zplane.de
2) Go to 'My Account' > 'My Products'
3) Your 'Unlock Code' will have been updated, so please use the serial number and unlock code to activate your Vielklang plug-in
If you are still having issues, please contact technical support here.