After you have upgraded to Platform Services 11.3, check your other components and upgrade them as necessary:
Upgrade the MDEX Engine to the latest version. For details, see the Oracle Commerce Guided Search MDEX Engine Migration Guide and the Oracle Commerce Guided Search MDEX Engine Installation Guide.
Upgrade Tools and Frameworks to version 11.3. For details, see the Oracle Commerce Guided Search Workbench Migration Guide and Oracle Commerce Guided Search Workbench Installation Guide.
Upgrade Developer Studio to version 11.3. For details, see the section "Upgrading a Developer Studio project" in this chapter.
Upgrade any other Guided Search packages to maintain compatibility among the components.