How to update VMware ESXi.
If VMware Infrastructure Update (VIU) is not installed, reinstall VMware Infrastructure Client (VIC) and select (VIU).
1. Shutdown all the virtual machines
2. Connect the VMware Infrastructure Client to the host that needs to be updated
3. Choose Start menu, Programs, VMware, VMware Infrastructure Update
4. On the Hosts tab, select the ESXi hosts to check for updates
5. On the Updates tab, click Check Now
6. Click on Install Updates, it will automatically download the Update
7. Once the update is downloaded, it will prompt for authentication and then install the update.
8. From VI Client, reboot the ESXi host