Sheep don't drop wool

Sheep don't drop wool anymore, so you have to use shears !A piece of mutton in the ground, with no wool nearby

Instalation

For the datapack version, go to the datapacks tab when creating a world, click the button to open the datapacks folder and drag the datapack inside, it should appear in the left side of the screen, after that enable it like you would do with an experimental datapack.

For the mod version (on windows), right click the start button and and go to execute, then enter %appdata% on it, this will open a folder, go to the .minecraft and then mods, drag the .jar there.