Information: Your serial number works both on Windows and on macOS.
Information for owners of the old version 1.0:
Users of capella melody trainer 1.0 can install the new version 1.1 free of charge!
The new version 1.1 can be directly installed over the existing version 1.0. All settings will be copied. Moreover the old version 1.0 will be automatically removed (unless it was installed for all users; in this case it can be uninstalled later on via the control panel.).