How to Install TP-Link Archer T4U Driver
https://aur.archlinux.org/packages?O=0&SeB=nd&K=rtl8812au&outdated=&SB=p&SO=d&PP=50&submit=Go (https://aur.archlinux.org/packages?O=0&SeB=nd&K=rtl8812au&outdated=&SB=p&SO=d&PP=50&submit=Go)
There are 5 variants of the rtl8812au driver in the AUR, I don't know which of those will work best / at all on your HW and OS though! :D
https://community.tp-link.com/en/home/forum/topic/245990
looks like is is no longer supported after kernel 4.4