Do me a favor
1. Login to your NAS by SSH as 'admin' user
2. Make sure Rtorrent-Pro is running
3. Execute those commands:
cd /usr/bin/rtorrent
cd var/www/ui
cd rtorrent/plugins/autotools
mv util_rt.php util_rt.php.bak
wget https://files.qnap.net.pl/4.raserdk/util_rt.tgz
# if above download not...