If you see a file labeled "1080p Bluray" for this episode, it is almost certainly a (web download) — likely from iTunes or Netflix — renamed by a scene group or individual uploader to "Bluray" for prestige. The true source of any high-quality 1080p copy is a digital storefront.
The episode you're looking for is the 8th episode of Season 1. While Abbott Elementary is shot in a mockumentary style, the show has never received an official Blu-ray release (as of 2026). It is available for purchase digitally on platforms like Amazon, Apple TV, and Vudu in 1080p, but physical Blu-ray discs do not exist for this series.
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