This message is not the sort of thing you would get from a corrupt license file. The license file location should be set within your environment variables under LM_LICENSE_FILE and you can change it from there. What does your license file start with?, I would expect something like:
FEATURE maxplus2 alterad 9999.12 31-oct-2015 uncounted XXXXXXXXXXXX
The 9999.12 shows the highest version which is supported by the license and the date afterwards (31-oct-2015) is the expiry date of the license. I suspect yours will look something similar.