OpenSubtitles.org czech encoding

Hi, I cannot solve this:

I am using agent to download subtitles: OpenSubtitles.org
I miss some characters in the subtitles.

How to solve this?

Thx you very much

Opensubtitles often serves up subtitles which are not encoded in UTF-8, as required in many Plex clients.
Let’s hope this can help you: https://forums.plex.tv/discussion/94864/rel-str2utf-8/p1#top

Best way is to use Sub-Zero Subtitles agent.