the video in a player like VLC or MPC-HC; it should detect and load the subtitles automatically. Manual Syncing (If Needed)

Subscene: Search for "Spectre" and look for the "720p.BluRay.x264.[YTS.AG]" tag.

the .zip file from one of the sites above and extract the .srt file.

OpenSubtitles: A massive database where you can filter by the specific YTS release.

You can typically find the correct subtitle file on these reputable platforms: