This texture pack is for life steal smps.
If this texture pack doesn't work, it means you have the wrong plugin installed
You can only use this texture pack from version 1.16 and above
Official site for the plugin: https://www.spigotmc.org/resources/life-steal-smp-plugin.94424/updates\
Aternos: https://aternos.org/addons/a/spigot/94424
Enjoy :)