Sub-Zero is a great, lightweight alternative to Bazarr. Both almost do the same thing but Sub-Zero comes in handy when immediate subtitles are needed. Sub-Zero might get obsolete in the near future.

• Download the release from here

• Upload the Sub-Zero.bundle folder to /home/hd*/username/.docker-conf/Library/Application Support/Plex Media Server/Plug-ins

• Restart Plex

• Go to Setting -> Agents in Plex

• Checkmark Sub-zero and move to the top according to the agent you are using.

• Configure Sub-Zero through the "settings wheel" icon.

  • Almost all settings will remain to default.
  • Choose which subtitle language you need, where to store it and when to fetch.
  • Put logins or API keys accordingly

• You can also find Sub-Zero inside Settings->Manage->Plugins.