TAC License server can't be started.
TAC license server crashes
TAC Vista 5.1.8
The license server can't start if there is a DEMO license in the same folder as the "real" license.
Note that in 5.1.8 the default path to the license files have changed to: C:\Program Files\Schneider Electric\License Server\TacLic\Licenses
Any license files that are in the old directory will be moved to the new one when upgrading. If you need to use DEMO licenses for a site you can add them to a separate directory and add that directory in the license setup.
Delete any DEMO licenses in:
C:\Program Files\Schneider Electric\License Server\TacLic\Licenses
Go to services and start TACLicenseServer