If the old installation had multiple server instances, run the migration utility once for each instance to migrate.

If you are migrating Integration Server, you can migrate an old instance to the new instance created during installation, to a new instance you created after installation, or to a new instance the utility creates for you.

If you are migrating Microservices Runtime, migrate each instance to a separate Microservices Runtime installation. Starting in 10.4, each Microservices Runtime supports only one server instance.