The Migration Guide covers the process to migrate to version 4.0.3 from an older version. Support for upgrading from versions 3.1+ are included in the 4.0.3 release files and documentation.
This migration guide assumes you have an existing installation of FlexDeploy on either WebLogic, Tomcat, or GlassFish application server (whether as a production implementation or a trial / proof of concept). For new installations, see FlexDeploy Installation Guide.