@Dk4Q 

Hello,

Is the model number of the TP-Link router is Archer C2? If yes, please help check below:

1. Who is your ISP and what kind of modem are you using? Is it a cable modem or DSL modem? With the modem connected to the blue/WAN port of C2, what about the internet LED? Is it green or orange？

2. If it is green, please log into the web page (Advanced-Status page) to check whether it obtains the IP address from the modem.
https://www.tp-link.com/faq-712.html

3. If IP address and DNS are there but you still cannot download or play games, please connect your computer to the modem directly and check the IP address, default gateway, and DNS, show us a screenshot of the status-details page:
https://www.tp-link.com/faq-838.html

4. Then please reconnect to the C2 by WIRED CABLE and log into the web page again and go to advanced-network-internet page to clone the mac address.
Note: Please clone the computer's mac address.

Any updates, please keep me posted.