UniqueSkyFactory4Textures-v1.0.zip is a release file of the Minecraft resource pack Unique Sky Factory 4 Textures (NEEDS OPTIFINE), made for Minecraft 1.12.2. It was published on May 28, 2020 and is 0.4 MB in size. For the full description, screenshots and every other version, visit the Unique Sky Factory 4 Textures (NEEDS OPTIFINE) resource pack page.
How to install: Put the .zip into .minecraft/resourcepacks (do not extract it) and enable it under Options → Resource Packs.