Serial Number Expired

I have encountered serial number expired. No matter what I changed to the source code, the hex file generated is still the same. What happen?
Serial Number Expired

I have encountered serial number expired. No matter what I changed to the source code, the hex file generated is still the same. What happen?
warning C500: Serial Number Expired

Hi, I have just updated to C51 8.12 and now get this error with every C file in the project. I cannot find reference to this warning in the knowledge base. Only unrelated ones to dongles/ports that...
warning C500: Serial Number Expired

Hi, I have just updated to C51 8.12 and now get this error with every C file in the project. I cannot find reference to this warning in the knowledge base. Only unrelated ones to dongles/ports that...
Keil 3 expired

I'm using ADuC7026 for project. But project already done in keil 3 & that was working. Keil 3 expired now, when I copied the same code in keil 4 it's showing errors. Please give me the solution...Thanks...