I got help from local Tp-link support: upgrade firmware and the problem solved. Thanks all!

Thanks for your help! It seems that the software can not detect and connect to the server (or router), when I run it, everything is grey, nothing can do. You can see it in the picture below:

Region : Vietnam Model : TL-WR842ND Hardware Version : V1 Firmware Version : ISP : Everything seems so good until I setting up the printer server. Resources CD contains the "USB Print Service Client...