Hi
please tell what's your oprerating system and what's the hardware version v1 or v2

I have Windows 7 Ultimate SP1 and its V1 (i think)

Model: TL-WN823N
IC: 8853A-WN823N
FCC ID: TE7WN823N

did you download the driver from the official website?
maybe you can try this:
http://www.tp-link.com/en/download/TL-WN823N_V1.html#Driver
the last one is for windows

Thanks, but how to open the Installer_RTL.pkg ?

Jaydon wrote

Thanks, but how to open the Installer_RTL.pkg ?

hi I guess you download the wrong file,pkg file is for mac OS,please download this TL-WN823N_V1_140918

Yeah, it was the wrong file :D

But how to open the
.cat
.inf
.sys
Files?

if there's no setup.exe file ,then you need to install manually,right click the computer icon on ur desktop and go to manage--device manager find the adapter ,it may conclude words like tp-link or unknow device or 802.11n NIC
right click it and choose upgrade the driver ,locate the file you've download and install