If you look closely at the screenshots of the Lithos 1.16.5-1.15.2 resource pack, You will notice that apparently of all the textures are similar to those that already have the standard version of the game, but actually the new resource pack have a big change, and more higher resolution of 32×32 pixels.
How to install the Lithos
- Install Optifine HD (Not necessary but desirable)
- Download a Resource Pack
- Unzip it and copy to C:\Users\User_Name\AppData\Roaming\.minecraft\resourcepacks
- In the game settings, select the desired resource pack