This instance of PART FOUR has first a Russian soundtrack, then an English one. The generally better-quality 7 GB complete series torrent has no English soundtrack for part four.
Also, the picture has been much restored (but a DVD rip should be better).
To get an idea of what to expect, download just the thumbnails jpg file which is in the torrent.
There are no subtitles that I have been able to find for part four.
Xvid 640x480 986 kbps 23.976 fps
AC3 192 kbps track 1, Russian (typical RU over EN voice-over)
AC3 128 kbps track 2, English
Two hours 36 minutes