The "Ri" typically denotes a Release or Rip by a specific private group or collector dedicated to preserving the integrity of the source.
The Immersion Edition was designed to give fans a deep dive into the creation of the album. It spans six discs and includes: Discs 1 & 2: The original studio album, digitally remastered. Discs 3 & 4: Is There Anybody Out There? The Wall Live 1980–81 pink floyd the wall flacsplitimmersion6cdri hot
Often found at retailers like CCMusic.com for ~$166. The "Ri" typically denotes a Release or Rip
Listening to the entire 6CD set is a 6-hour marathon. It is not background music. It is a therapy session. Discs 3 & 4: Is There Anybody Out There
For listeners seeking high-fidelity FLAC splits of this set, note the following: No High-Res Audio : Unlike the Dark Side of the Moon Wish You Were Here Immersion sets, include a Blu-ray or high-resolution 5.1 surround mix. Standard Resolution
If you are looking for information on what this set actually contains, it is the most comprehensive official look at the album's evolution: Content Description