1. I am sticking this in vSphere forum so eyeballs see it. I am sorry, I blame VMWare for making reporting this problem difficult. I previously successfully signed in to the forum using “Google Chrome, Version 84.0.4147.105 (Official Build) (64-bit)” on Windows 10.
2. This is also seen with end point software, you need to disable or remove it prior to installation. Installing vSphere Client fails with the error: Failed to create service for hcmon driver vSphere Client 5.1 のインストールが次のエラーで失敗する： hcmon のインストールに失敗しました.

• Vsphere Client Failed To Install Hcmon Driver Windows 10 32-bit
• Vsphere Client Failed To Install Hcmon Driver Windows 10 64-bit

Re: VI Client 5.1 fails to Install - HCMON Driver n2spcmusc Mar 26, 2015 6:49 PM ( in response to jimcallaghan ) I found this same issue upgrading my vSphere client to 6.0 on a Win7 system with the Lumension Endpoint Protection 4.5 client installed.

VMware Remote Console | 08 December 2015 | Build 3250412 Check for additions and updates to these release notes. Last Document Update: 10 February 2016

What's in the Release Notes

The release notes cover the following topics:

What's New

VMware Remote Console 8.0 provides complete functionality on virtual machine operations and settings to vSphere administrators, but only limited functionality is available on virtual machine operations such as console, mouse and keyboard operations to vRealize Automation users.
VMware Remote Console 8.0 supports:

• vRealize Automation 6.2.3 with console proxy
• Smart cards
• Auto Update for Windows
• 32-bit Windows

Compatibility and Installation

VMware Remote Console and host OS version compatibility

VMware Remote Console is compatible with the following 64-bit and 32-bit Windows host operating systems:

• Windows Server 2012 R2
• Windows Server 2012
• Windows Server 2008 R2 SP1
• Windows Server 2008 R2
• Windows 7
• Windows 8.1
• Windows 8
• Windows 10
  

VMware Remote Console is also compatible with the following Mac host operating systems:

• Apple OS X 10.8 (Mountain Lion)
• Apple OS X 10.9 (Mavericks)
• Apple OS X 10.10 (Yosemite)
• Apple OS X 10.11 (El Capitan)

Installation Notes for This Release

Read the following documentation for guidance about installing and using VMRC:

Known Issues

This release has the following known issues for Windows OS:

• Running VMRC without a URL will fail.
  Workaround: Open a URL of the form: vmrc://[<user>|(<ticket-type>:<ticket>)@]<host>[:<port>]/?moid=<VM-id>.

• VMRC displays an empty, black console when connecting to a virtual machine.
  Workaround: None

• VMRC might prompt The keyboard hook timeout value is not set to the value recommended by VMware Remote Console when connected to a virtual machine.
  Workaround: Click OK to update the value and log out of Windows to ensure the update takes effect.
  
• Installing VMRC client on Windows 10 might fail with an error Failed to install the HCmon driver.
  Workaround: Run the elevated command prompt as an Administrator.
  

Vsphere Client Failed To Install Hcmon Driver Windows 10 32-bit

This release has the following known issues for Apple OS X:

Vsphere Client Failed To Install Hcmon Driver Windows 10 64-bit

• VMRC might not add new devices such as DVD and CD-ROM drives or an existing virtual hard disk to a virtual machine.
  Workaround: None
  
• VMRC does not display sound card settings.
  Workaround: None