VMware - Update Manager Not Showing Up In vCenter or vSphere Client

I setup a VM with VMware Update Manager from the 5.5 U3 vCenter download.  I'm running vCenter (Applicance) 5.5.0 build 4180647 (which should be vCenter 5.5 U3e).  I've tried installing the plug-in in the vSphere client (5.5.0 build 1993072 and build 4032365) and I click to install the plugin, it says 100% downloaded and then goes right back to being able to click to download again.  It never seems to install.  I've also logged into the vCenter web client and Update Manager isn't there either. 

I ran the  VMwareUpdateManagerUtility.exe and re-registered with vCenter by name and by IP, but it still never shows up. 

Clients I've tried are Windows 8.1 and Windows 10 and Update Manager is installed on Server 2012 R2.  Help please!