Nostalgia Shader v3.0 is a release file of the Minecraft shader Nostalgia Shader, made for Minecraft 1.14.4, 1.16.5, 1.15.2, 1.16.4, 1.12.2, 1.13.2. It was published on March 2, 2021 and is 0.5 MB in size. For the full description, screenshots and every other version, visit the Nostalgia Shader shader page.
How to install: Put the .zip into .minecraft/shaderpacks (do not extract it) and select it under Options → Video Settings → Shader Packs. Needs Iris or OptiFine.