I don't see this plugin in (SRT2UTF-8) at Plex Agents

Server Version#: DSM 6.2.2-24922 Update 4 (DS218+)
Player Version#:4.22.3 (2020)

Hi
I am new to Plex and my Plex media server in NAS - Synology. I am facing problems with subtitles in Arabic. So I found this bundle (SRT2UTF-8.bundle V0.0.2.5) .

This is my first plugin installed on Plex. I install the bundle and put it in Synology in this path:
/Plex/Library/Application Support/Plex Media Server/Plug-ins

When I try to open Plex, I don’t see it in Agents for both movies and TS Shows.

Ref for pic: https://github.com/ukdtom/SRT2UTF-8.bundle/issues/48

Help me please

Please don’t have an open issue on GitHub as well as a forum thread!