i Want to fix an old tool but i can't? [closed]

Hi i wan't to fix a tool called JetBoots because i am fixing some of the roblox games the tool is from 2008 so it is broken here is the script

print("Jet Boots loaded")

bin = script.Parent

walking = false
reloadtime = 0

local thrust = Instance.new("BodyVelocity")
local velocity = 0
local max_velocity = 30
local flight_time = 6



function onStart()
    print("start walking")
    walking = true
    reloadtime = 8.0

    thrust.Parent = game.Players.LocalPlayer.Character.PrimaryPart

    thrust.velocity = Vector3.new(0,velocity,0)
    thrust.maxForce = Vector3.new(0,4e+003,0) 

    local sound = game.Players.LocalPlayer.Character.PrimaryPart:findFirstChild("JetbootSound")
    if sound == nil then 
        sound = Instance.new("Sound")
        sound.Name = "JetbootSound"
        sound.SoundId = "rbxasset://sounds\\Rocket whoosh 01.wav"
        sound.Looped = true
        sound.Parent = game.Players.LocalPlayer.Character.PrimaryPart
    end
    sound:play()

end

function onEnd()
    print("stop walking")
    walking = false
    thrust.Parent = nil
    local sound = game.Players.LocalPlayer.Character.PrimaryPart:findFirstChild("JetbootSound")
    if sound ~= nil then sound:stop() end
    wait(reloadtime)
    reloadtime = 0
end

function onButton1Down(mouse)
    if reloadtime > 0 then return end
    if walking == true then return end

    onStart()
    mouse.Icon = "rbxasset://textures\\ArrowFarCursor.png"

    local time = 0
    while walking == true do
        --onWalk()
        wait(.2)
        time = time + .2
        velocity = (max_velocity  * (time / flight_time)) + 3 
        thrust.velocity = Vector3.new(0,velocity,0)

        if time > flight_time then onButton1Up(mouse) end
    end
end

function onButton1Up(mouse)
    onEnd()
    mouse.Icon = "rbxasset://textures\\ArrowCursor.png"
end

function onSelected(mouse)
    print("ghostwalker selected")
    if reloadtime > 0 then
        mouse.Icon = "rbxasset://textures\\ArrowFarCursor.png"
    else
        mouse.Icon = "rbxasset://textures\\ArrowCursor.png"
    end
    mouse.Button1Down:connect(function() onButton1Down(mouse) end)
    mouse.Button1Up:connect(function() onButton1Up(mouse) end)
end

bin.Selected:connect(onSelected)

also i forgot to say that it is hopperbin not a tool what is the difference ?