Hi, You can refer to the FAQ: http://www.tp-link.com/us/faq-1084.html. During the setup process, it's suggested to disconnect the main router and C50, and it's better to change the LAN IP of C50 to...

;)everyone may make a mistake.Glad to hear it is working now.

It should be a compatible issue between the laptop and the router. Here is a beta firmware to solve the compatible issue between killer adapter and Archer C7 V3. You can have a try....

That's easy. You can change the IP address of the TP-Link router to something else. Unplugged the tp-link router from your Centurylink router, connect a PC or any other device to tp-link router,...

Did you setup the time settings correctly? Is your router with the latest firmware? You may share us the settings screenshots, so we can help to check.

I replied the same issue here. You can wait for the new firmware. suggestion