The Killer Network Manager is our outgoing performance suite. It is no longer being updated, and does not contain the latest Ethernet or Wi-Fi drivers. We encourage all users of the Killer Wireless-AC 1525/1535/1435, Killer Wireless-N 1202/1103, Killer E2200, Killer E2400, and Killer E2500 to upgrade to the Killer Control Center, found here - http://www.killernetworking.com/driver-downloads/item/killer-control-center-x64. This includes users whose machines came with the Killer Network Manager preinstalled. There is no need to continue using the Killer Network Manager.
For a smooth installation, download the latest Killer Control Center installation package, then uninstall all Killer products from your Apps and Features menu, which is accessible by right-clicking Start, then restart your computer, and double-click the new installation package to install the new Killer Control Center.
If you have any further issues installing the Killer Control Center, or uninstalling the Killer Network Manager, please see this troubleshooting article - https://www.killernetworking.com/driver-downloads/kb/faq/6-troubleshooting-killer-ethernet-wireless-drivers-software.
The old Killer Network Manager suite is still available for download here - http://www.killernetworking.com/driver-downloads/item/e2200-e2400-wireless - but will no longer be updated, and may not be fully compatible with future Windows updates, antivirus suites, or other applications that manipulate network data.