Windows XP -  C:/Documents and Settings/All Users/Applications Data/Gibbs/GibbsCAM/LicenseData

Windows Vista, Windows 7, Windows 8 and Windows 10  -  C:/ProgramData/Gibbs/GibbsCAM/LicenseData

Both of these paths may be hidden on your system.  Your local IT people can help you to view these paths or you can call GibbsCAM Technical Support at 800-654-9399 for more assistance.