All Language Subtitles - Rurouni.Kenshin.Final.Chapter.Part.I.
Provides a comprehensive list of English subtitles for 720p and 1080p BluRay/WEBRip versions.
Currently hosting the new 2023 anime series, though availability for the live-action films varies by region.
You can find .srt and .ass files specifically for the "Final Chapter Part I" release at these sources:
Offers multiple versions including Pahe.in, YTS, and Netflix-sourced subtitles in various languages.