Below we have compiled the "License Activator's" error messages:
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There was a problem in the creation of the serial number. It seems to be not correct.
Cannot validate license.
This error means that the gateway login and/or the activation key are not correct.
If the "License Activator" application has been executed from outside the plugin (it is a separate application) you will get this error as well. In this case the error appears, because the application has not been used as originally intended.
The system cannot be identified. Cannot detect the system Host ID.
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This error points to a license conflict, e.g. when RealFlow | Cinema 4D 2.0 tries to read a 1.0 license. In this case, remove/rename the 1.0 license file and replace it with you your new 2.0 file.