Script Doesn't Work?

A very outdated script that I bought off someone about 2 years ago. Want to re use it but can't work out whats wrong, it does not 'give' the player the GUI or the Camera

script.Parent.Camera.Disabled = false

script.Parent.Touched:connect(function(Part)
    if (Part.Parent:FindFirstChild("Humanoid") ~= nil) then
        wait()
        if (Part.Parent:FindFirstChild("Humanoid").Sit == true) then
                        script.Parent.MaxNumber.Value = 0
                        local c = game.Workspace:GetChildren()
                        for i =1,#c do
                        if (c[i]:FindFirstChild("SBCameraMesh") ~= nil) then
                        script.Parent.MaxNumber.Value = script.Parent.MaxNumber.Value + 1
                        c[i].Name = "CameraType"..script.Parent.MaxNumber.Value
                        end
                        end
                        game.Players:GetPlayerFromCharacter(Part.Parent).Character.Parent = script.Parent.Parent
            local cam = script.Parent.Camera:Clone()
            cam.Parent = game.Players:GetPlayerFromCharacter(Part.Parent).Backpack
            local gui = script.Parent.ScreenGui:Clone()
                        if game.Players:GetPlayerFromCharacter(Part.Parent).PlayerGui:findFirstChild(gui.Name) ~= nil then return end
                        script.Parent.MaxNumber:clone().Parent = gui
            gui.Parent = game.Players:GetPlayerFromCharacter(Part.Parent).PlayerGui
        end

    end
end)