Subtitles that start in sync and drift further away as the film plays were made for a version with another frame rate, usually 25 fps (PAL) against 23.976 fps. Converting the frame rate stretches all times to fit your video.
Load your subtitle file.
Pick the frame rate the subtitles were made for and the frame rate of your video.
Download the file and check it at the start and near the end of the video.
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In VLC open Tools > Media Information > Codec. On Windows, right-click the file > Properties > Details. European TV releases are usually 25 fps, most Blu-ray and web releases 23.976 fps.
If the subtitles come earlier and earlier, convert from 25 to 23.976. If they come later and later, convert from 23.976 to 25. Not sure? Try one and check near the end of the video.
SUB files count video frames. The frame rate written in the file is used (or the one you pick as the original), so the times come out right in any format.