Classic Halloween π Update 1 is a release file of the Minecraft resource pack CLASSIC HALLOWEEN, made for Minecraft 1.17.1. It was published on October 19, 2021 and is 0.9 MB in size. For the full description, screenshots and every other version, visit the CLASSIC HALLOWEEN resource pack page.
How to install: Put the .zip into .minecraft/resourcepacks (do not extract it) and enable it under Options β Resource Packs.