If you cannot find subtitles specifically tagged "ShaAniG", look for generic BluRay subtitles.
For the "720p.BluRay.x264.ShAaNiG" release, you should look for subtitle files specifically labeled with these tags: gameofthronesseason4720pblurayx264shaanig subtitles
Search for "Game of Thrones - Fourth Season." Filter for English (or your preferred language) and look for "BluRay" in the title. If you cannot find subtitles specifically tagged "ShaAniG",
You can find the specific subtitles for the Shaanig release on major subtitle repositories. Here are the direct links to the Season 4, Episode 1 subtitle pages: gameofthronesseason4720pblurayx264shaanig subtitles
Typical specs for this release: