Just bought a new AC1900/T9UH from a well known retailer here in Australia and cannot get internet access. Initially downloaded what I assume was the latest software from tp-link.com (TP-Link Archer T9UH_V2_181023_Win) and followed the installation video using another old NetGear adapter. It would not connect so I uninstalled and reinstalled from the supplied CD. Turned out to be the same software as the downloaded one (TP-Link Technologies Co.. Ltd. 11/09/2017 1030.22.405.2017)
Then let Windows install the driver (Microsoft 25/10/2018 1030.27.425.2018 Microsoft Windows) Still no joy.
Followed the troubleshooting video on each occasion - all say device working properly and WLAN AutoConfg is running.
My router and wi-fi to this room are obviously fine as I'm now connected to do this using my old, old NetGear mini adapter to do this (the Asus 2T2R I had used for 5 years had an issue when a wire pulled out, hence the purchase of the Archer T9UH).
I did read a review which said the T9UH wouldn't work with Win 10 but assumed that was erroneous as Net Gear's own videos for it use Win 10.
The driver installation package can find the adapter to start installation and the blue LED is constantly blinking at regular intervals which I assume is fine. I'm only using a 2.4Ghz router and even though this room is upstairs from the router it's only maybe 25 - 30 feet away in a straight line. I haven't tried using WPS as I am significantly disabled by a form of MND and no way I can press the router button and get up here in time to press it on the adapter.
Help please..... Given my old cheap NetGear adapter is working I can't see why a much more expensive and sophisticated adapter as the T9UH won't.