If 2.4G or 5G led is lit, reboot both the extender and your router. And contact tplink support.

after the reset, do you create a new password? or keep admin? do those welcome windows look the same before and after the reset?

maybe some programs on your computer, firewall, antivirus, is preventing the installation. go into safe mode and try again.

Usually there is manual time input for router. RE200 is not a router. If you need correct time on the extender, contact tplink support, tell them the details of your extender, let them test it.

So the network is connected on your Dell but no internet, right? Check the WiFi IP address, gateway of the Dell laptop. If no valid IP address, or the gateway address is the LAN IP address of the...

Samsung powerbank? Man, this is tplink forum.....