SYMPTOM:
System manager workflow fails to execute with error "The workflow has expired.: This workflow cannot be executed because its license has expired. To use this workflow, update your license key and re-save it again from workflow designer."

CAUSE:
The reason behind this problem is the expiration of the license key on the machine where System Manager is installed. The license key is stored within the .smw definition. When executing a workflow, the license key is validated, if the license key is invalid, an error occurs.
ACTION:
1: Update the license key.
2. Re-save workflow from System Manager.
** The System Manager workflows need to be re-saved in order to update the license key stored in the definition. Once updated, the workflow should execute successfully.