vCenter Server will not be able to manage ESXi 5.5 Update 3b, if you update ESXi before updating vCenter Server to version 5.5 Update 3b. For more information, see the KB article linked below. KB 2140304.
Customers who have purchased VMware vSphere with Operations Management 5.5 can download their relevant installation package from the product download tab below.
Important Note: Customers who have purchased VMware vSphere with Operations Management 5.5 are entitled to vRealize Operations 6.0. vRealize Operations 6.0 is compatible with all editions of vSphere with Operations Management 5.5. Important information regarding the upgrade sequence and interoperability can be found in the following KB 2100434. VMware highly recommends that this information be reviewed prior to installing or upgrading multiple components.
VMware vSphere with Operations Management 5.5 is available exclusively on the vSphere ESXi Hypervisor Architecture. ESXi is the latest hypervisor architecture and users can upgrade to ESXi from ESX as part of an upgrade to vSphere with Operations Management 5.5.
Once you have purchased VMware vSphere with Operations Management 5.5, you will receive a licensing confirmation email with your license keys or you can retrieve your license keys from the vSphere License portal.