The editions (both the Complete Season and individual volumes) consistently feature English SDH subtitles as a standard option. Most "New" retail versions are available as either a single Complete Fifth Season box set or two separate releases: Volume 1 and Volume 2. Subtitle and Audio Specifications
Occasionally, the new Bluray uses a different frame rate (23.976fps) than some streaming copies. Use a tool like Subtitle Edit → "Synchronization" → "Adjust all times" by +200ms if the audio feels slightly ahead of the subs. vikings season 5 english subtitles bluray new