For most players, "Better Leaves" is a texture pack that adds 3D layers to leaf blocks.
If by "useful paper" you meant the , it is highly recommended for running mods like Better Leaves on a server because it provides optimized performance and protection against exploits. You can download the Paper server JAR from PaperMC . Download Better Leaves zip
: You may need to download the source files and use a Python script to compile a custom version of the .zip if you want it to work with other specific texture packs. For most players, "Better Leaves" is a texture
If you are looking for the "useful paper" regarding custom builds or compatibility (often found on GitHub or the MidnightDust Wiki ), the process is more technical: : You may need to download the source
: This is the resource pack itself. You should not unzip it; instead, move the entire .zip folder into your Minecraft resourcepacks folder.