updated 03-22-2017
Fix error “”duet” 不再可用”
Source video
Follow this video in YouTube.
Quote from YouTube
Links:
Duet Display IPA: http://bit.ly/2jvH3WR
Cydia Impactor Link: http://bit.ly/1bv4PDK
Download Duet IPA
Duet Display IPA, copy the follows url and download.http://down5.dailyuploads.net:182/d/zicch26joghlriinqndkca2paz7zppcgdlhoa6tbe2u4334fbte4z2h2/Duet%20Display%20[Duet%20Inc.]%20(v1.3.7%20v6%203GS%20Univ%20LP%20os80)-Widow.rc334d_902.ipa
Download Cydia Impactor (Win7)
From this Cydia Impactor website, I choose the windows version
Download Duet (Windows OS)
Install Duet in window 7, PC download here)