You may get the following error when you try to add a serial number in SourceAnywhere for VSS Server Manager.
The serial number is not compatible with the SourceAnywhere for VSS Server.
Please check the edition of SourceAnywhere for VSS you are using and make sure the serial number is compatible. SourceAnywhere for VSS has Professional Edition and Standard Edition.
For information on the differences between the two editions, see: http://www.dynamsoft.com/Products/SAW_EditionComparison.aspx