The newest version textures for version 1.8.8 and 1.12 made specifically for Eaglercraft
https://www.curseforge.com/minecraft/texture-packs/moderntexturesforeaglercraft
https://modrinth.com/resourcepack/1.21-textures-in-1.8.8
https://www.mediafire.com/folder/movywennz6jls/1.8.8_Textures
https://www.mediafire.com/folder/0awko1gctrjca/1.12_Textures