Here is the new firmware from 19.07 branch, added lots of new features, running stable.
*Installation Method via TFTP recovery
*A network switch is needed between the router and computer running TFTP server as mentioned by: bam80
*After flashing recovery image from TFTP, need to upgrade the firmware again from OpenWrt "Backup / Flash Firmware" page using sysupgrade image to get advanced features like OpenVPN, DNS-Over-Https.
Here are some screenshots of Modified Luci-Material GUI:
If you are a developer or advanced user you can always compile it from source.
This is the branch which I compiled from: openwrt-19.07
Here is the .config file used to compile it: .config
*Rename it to .config and put it under the path where you cloned the git repository.
Also here is the TP-Link branding GUI mod: gui_mod.zip
*There is a README.txt inside the zip file, please read it before any modification.