Horizon View and "Blast" protocol

Hello,

        I recently updated our Connection Servers and Security Servers to Horizon View 5.2 and I see the option to enable HTML5 access to the pool but it states that a desktop feature pack needs to be installed.  I haven't been able to find this "feature pack" anywhere.  I've been digging through the administration guide for 5.2 and it really doesn't mention anything about HTML access.

Can someone point me in the right direction so I can start doing some testing with HTML5 access to View desktops?

Thanks!