You must upgrade the management domain before upgrading workload domains in your environment. In order to upgrade to VMware Cloud Foundation 4.2, the management domain must be at VMware Cloud Foundation 4.1 or

Components in the management domain must be upgraded in the following order:
  1. SDDC Manager and VMware Cloud Foundation services. See Upgrade VMware Cloud Foundation Software.
  2. vRealize Suite Lifecycle Manager and vRealize Suite products. See Upgrade vRealize Suite Lifecycle Manager.
  3. NSX-T Data Center. See Upgrade NSX-T Data Center.
  4. vCenter Server. See Upgrade vCenter Server.
  5. ESXi. See Upgrade ESXi.