After installing Enfocus PitStop Pro, you can activate it from the PitStop Pro dialog. This dialog pops up automatically when using Enfocus PitStop Pro for the first time. If it is not opened automatically, you can open it yourself. Refer to Opening the About Enfocus PitStop Pro dialog.
Enfocus PitStop Workgroup Manager manages licenses and resources (example: Action Lists and Preflight Profiles) centrally. When you use PitStop Pro in combination with Enfocus PitStop Workgroup Manager, PitStop Pro can retrieve a floating license from Enfocus PitStop Workgroup Manager. In that case, you don't have to activate PitStop Pro. For more information, refer to the Enfocus PitStop Workgroup Manager documentation.