Download Hyper-v Manager For Windows Server 2016
Andrea Bowden
Consider using Windows Admin Center -admin-center-for-windows-server Opens a new window instead of classic tools. It covers the Hyper-V management almost entirely and is web-based, so it doesn't require you to RDP to a Windows machine every time you need to manage your VMs. Moreover, you could run a Core edition of the hypervisor to increase security and reduce patching.
Basically, starting with Windows Server 2012 / Windows 8.1 and up to Windows Server 2016 / Windows 10, Hyper-V manager can manage same and older versions of Hyper-V.For older versions, only the the matching server and client versions of Windows are compatible.
I ran into this issue on my Windows 8.1 machine as well, it may be because I have the Client Hyper-V role installed, but I was able to 'get around' the issue by loading up the Hyper-V Manager, connecting each of the servers I wanted, then right-clicking on each one and selecting 'Remove Server', then when it asks, select 'Connect' (to essentially reconnect the next time it's loaded). Do this for all of the servers you've added, then close and re-open the Hyper-V manager, hopefully that'll work for you.
You need either a Windows 8 workstation or a Windows Server 2012/R2 OS elsewhere, because Hyper-V server does not have the ability to run GUI tools (Hyper-V manager included). You add "Hyper-V" feature on that OS and connect to your Hyper-V server via Hyper-V manager console.