Torrent clients permitted on ADC (WHITELIST)

Azureus: v.4.x, v.5.x
BitComet v.1.58, v.1.61
Bittorrent: v.6.x, v.7.x
Deluge: v.1.3.15, v.2.0.3 & up
qBittorrent v.4.0.x, v.4.1.x.x, v.4.2.5, v.4.3.4.x, v.4.3.9, v.4.4.5, v.4.5.2 - v.4.5.5
rTorrent: all
Transmission: v.2.xx, v.3.0, v.4.0.3
Tixati: all
uTorrent: v.2.x, v.3.x

Why qBittorrent is not allowed above v4.5.5.?
In the late versions qbit developers added an option to choose which torrent engine you use, libtorrent v1 (lt1), which is acceptable and v2 (lt20) that brings chaos to the tracker. Since people do not understand simple and plain: do not download lt20, we were forced to forbid versions above v4.5.5 altogether.
It is not possible to block only download of this experimental version, because they provide identical signature to the server.