cDevWorkflow comes in 2 versions: Community Edition and Professional Edition

Community Edition comes with a 30 day license, that you can renew to any number of times.  Professional Edition comes with a 1 year license, that has to be renewed and paid yearly.

In order to activate your license, login to the Configuration Manager and navigate to the Status tab.  The Status tab will display the status of your license, if you need to activate, enter the required information into the fields and click to activate the license.  If the license needs to be renewed, simply click the Renew button.