@atithasos: The line should be added to the top of prototypes/entities.lua:
local sounds = require("__base__.prototypes.entity.demo-sounds") -- ADDED
data:extend{
  {
type = "logistic-robot",
…
{
  filename = "__AtomicRobotsFixv__/graphics/entity/logistic-robot/logistic bot shadow.png",
  priority = "high",
  line_length = 16,
  width = 128,
  height = 128,
      scale = 0.5,
  frame_count = 1,
  shift = {0.0, 0.0},
  direction_count = 16
},
working_sound = sounds.flying_robot(0.5),    -- CHANGED
cargo_centered = {0.0, 0.2},
  },
  {
type = "construction-robot",
…
{
    filename = "__base__/graphics/entity/sparks/sparks-06.png",
    width = 44,
    height = 36,
    frame_count = 19,
    line_length = 19,
    shift = {0.03125, 0.3125},
    tint = { r = 1.0, g = 0.9, b = 0.0, a = 1.0 },
    animation_speed = 0.3,
  },
},
working_sound = sounds.flying_robot(0.5),    -- CHANGED
cargo_centered = {0.0, 0.2},
construction_vector = {0.30, 0.22},
  }
}
I just checked, the game still loads for me with the changes from my previous post. Perhaps you could post the error message you get? Could be just a typo that breaks things, a forgotten comma or something similar.