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The required Version Label stems from an Application Version previously provisioned - assuming an Application already exists, the typical deployment cycle is as follows:

• upload a source bundle via the S3 Object task's Upload action
• create a version via the Elastic Beanstalk Application Version task's Create action
• deploy that version via the Elastic Beanstalk Environment task's Update action

The Swap action enables Deploying Versions with Zero Downtime  by swapping the URLs between two environments - this concept is also referred to as a Blue-Green deployments.