As the title says, I'm getting obsolete warnings in the unity car tutorial. Here are the warnings.

C# Warnings

Assets/Scripts/CSharpScripts/BirdsBehaviour.cs(13,36): warning CS0618: UnityEngine.QualitySettings.currentLevel' is obsolete:Use GetQualityLevel and SetQualityLevel'

Assets/Scripts/CSharpScripts/BirdsBehaviour.cs(13,64): warning CS0618: UnityEngine.QualityLevel' is obsolete:See QualitySettings.names, QualitySettings.SetQualityLevel, and QualitySettings.GetQualityLevel'

Assets/Scripts/CSharpScripts/EffectController.cs(13,36): warning CS0618: UnityEngine.QualitySettings.currentLevel' is obsolete:Use GetQualityLevel and SetQualityLevel'

Assets/Scripts/CSharpScripts/EffectController.cs(13,64): warning CS0618: UnityEngine.QualityLevel' is obsolete:See QualitySettings.names, QualitySettings.SetQualityLevel, and QualitySettings.GetQualityLevel'

Javascript Warnings

Assets/Scripts/JavaScripts/FPSCounter.js(54,113): BCW0012: WARNING: 'UnityEngine.QualitySettings.currentLevel' is obsolete. Use GetQualityLevel and SetQualityLevel

Assets/Scripts/JavaScripts/PerformanceTweak.js(181,36): BCW0012: WARNING: 'UnityEngine.QualitySettings.currentLevel' is obsolete. Use GetQualityLevel and SetQualityLevel

Assets/Scripts/JavaScripts/PerformanceTweak.js(186,36): BCW0012: WARNING: 'UnityEngine.QualitySettings.currentLevel' is obsolete. Use GetQualityLevel and SetQualityLevel

Assets/Scripts/JavaScripts/PerformanceTweak.js(190,28): BCW0012: WARNING: 'UnityEngine.QualitySettings.currentLevel' is obsolete. Use GetQualityLevel and SetQualityLevel

Can someone help me fix these? I want to adapt this tutorial to my car racing game, but I feel I cannot adapt it fully if I'm getting these warnings. If someone could help me that would be great.

Edit: Here is more specific information. I know these warnings are a repeat. I just wanted to post them anyway, just in case.

Here is where the problem starts in BirdsBehaviour.cs

void Start()
    {
       if(QualitySettings.currentLevel < QualityLevel.Good)
       {
         this.enabled = false;
         return;
       }
       birdTimer = Random.Range(2,5);
    }

Here is where the problem is happening in EffectController.cs

void Update()
{
    if(QualitySettings.currentLevel < QualityLevel.Good)
    {
       if (generate2dReflection)
         generate2dReflection.enabled = false;
       if (glowEffect)
         glowEffect.enabled = false;
       if (motionBlur)   
         motionBlur.enabled = false;
       if (colorCorrection)
         colorCorrection.enabled = false;
    }
    else
    {
       if (generate2dReflection)
         generate2dReflection.enabled = true;
       if (glowEffect)
         glowEffect.enabled = true;
       if (motionBlur)
         motionBlur.enabled = true;
       if (colorCorrection)
         colorCorrection.enabled = true;
    }
}

Here is where the problem is happening in FPSCounter.js

function OnGUI()
{
    GUI.Box(new Rect(Screen.width-160, 10, 150, 40), fps.ToString("f2") + " | QSetting: " + QualitySettings.currentLevel);
}

Here is where the problem is happening in PerformanceTweak.js

{
       if(QualitySettings.currentLevel > QualityLevel.Fastest)
         QualitySettings.DecreaseLevel();
    }
    else if(fps > highFPS)
    {
       if(QualitySettings.currentLevel < QualityLevel.Fantastic)
         QualitySettings.IncreaseLevel();
    }

    if(QualitySettings.currentLevel < QualityLevel.Good)