Licenses for many Steinberg programs are stored in the so called Soft-eLicenser, a virtual license container on the hard disk. In the eLicenser Control Center - the license managing tool used by all Steinberg programs - the Soft-eLicenser is represented by a hard disk symbol. Each Soft-eLicenser must have a unique number which is required for the program activation.
On trying to activate a license an error message comes up: "Unfortunately, the serial number of your Soft-eLicenser is not unique"
Please download and install the latest available eLicenser Control Center version from here.
The current versions (starting with 126.96.36.19994) can regenerate the invalid Soft-eLicenser number automatically and the activation of a license should work after the installation.