If you have a "full usage" license, it doesn't expire. Your license will run your current version of CAESAR II forever on your current computer and OS. (Take "forever" with a grain of salt here. The license won't expire, but if somthing breaks, or you change the OS and things don't work, you will have to be on maintenance to obtain Support.) The license does not know when your maintenance period expires, for that you will have to contact your Sales Representative.
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Regards,
Richard Ay - Consultant