is it vanilla or with modpack? i am interested to play a modpack multiplayer

To temporarily fix the mods not loading problem on 15.9 ,open the file 'data-updates.lua' inside zip file and find this line:

for _,item in pairs(data.raw.unit) do
item.healing_per_tick = item.healing_per_tick * settings.startup["5d-bicho-healing"].value
end


replace it as

for _,item in ...