@dresoccer4  Hello, 

Clear the browsing history and cache and try a different Web browser on your laptop to login ' tplinkrepeater.net' 

Try a different device, like a different computer or cell phone to log in Web UI. 

You could reserve an IP address for range extender on router ( set up on IP reservation for RE on router's settings), in that way  RE 's IP does not often change and you could login via RE's IP address. 

@dresoccer4 

' tplinkrepeater.net' corresponds to the IP address of RE , after RE being set up, RE will get a new IP address from router and the IP could be found on router's DHCP client list

Or could type in 'cmd' in Windows search bar to open command window,  put in ' nslookup tplinkrepeater.net ' to check the IP address . 

Sometimes browsers will direct to the Google search results when use the domain, but domain should be working as we often use domain to set up RE or test its firmware.  

You could also try Incognito Mode on the browsers  clear the browser cache and history and try to login.

Just type in ' tplinkrepeater.net ' in the address bar. 

If still the same, may I have a photo of the login page, which browser you have tried, thank you.