To install WorkFlow Pro, complete the following steps:
Log in to your Jira instance as an administrator.
Select the Jira Settings cog (
) in the top right of your Jira instance and select Apps. 
The Discover Apps and Integrations for Jira page displays.
Use the Search tool to find WorkFlow Pro.
Select the Workflow Pro app.
Select Get app to install it.
Select Get is now to confirm. A confirmation message displays. A success message displays once the installation is complete.