For two weeks in 2019, MUBI streamed a restored version of The Obscure Spring with official English subtitles. Copies of that stream exist in the hard drives of dedicated film archivists. Check private trackers dedicated to arthouse cinema (like Karagarga or Cinemageddon). Search for "La Primavera Oscura 2014 MUBI WEB-DL." That file contains the Holy Grail of subtitle tracks.
: An unhappily married plumber who has become bored with the monotony of his life. the obscure spring subtitles
If you own a physical or digital copy without the desired language, you can find subtitle files (usually in format) on major community repositories: OpenSubtitles: The largest database for various languages. For two weeks in 2019, MUBI streamed a
If you already have a desynced subtitle file, use Subtitle Edit (free software). Load your video file, then load the subtitle track. Use the "Waveform" visual tool. The first line of dialogue occurs at exactly 00:02:17.500 on most BluRays. Adjust the delay by -1,200ms and save. You have now improved upon 90% of the available subtitle files online. Search for "La Primavera Oscura 2014 MUBI WEB-DL
To understand why you cannot settle for bad subtitles, consider the film’s most devastating sequence. Two characters, Lucio and Irene, sit on a public bus. They do not touch. The camera watches them from across the aisle. Irene whispers: