How do I access a boolean from another class in c#?

This is my code and Im trying to access bool Press(line 3) in another script.

using UnityEngine;

public class Runner : MonoBehaviour {

 public static float distanceTraveled;
 private static int boosts;
 public static bool Press = false;

 public float acceleration;
 public Vector3 boostVelocity, jumpVelocity;
 public float gameOverY;
 
 private bool touchingPlatform;
 private Vector3 startPosition;

 void Start () {
     GameEventManager.GameStart += GameStart;
     GameEventManager.GameOver += GameOver;
     startPosition = transform.localPosition;
     renderer.enabled = false;
     rigidbody.isKinematic = true;
     enabled = false;
 }


 public static void Update () {
     if(Press == true){
         if(touchingPlatform){
             rigidbody.AddForce(jumpVelocity, ForceMode.VelocityChange);
             touchingPlatform = false;
         }
         else if(boosts > 0){
             rigidbody.AddForce(boostVelocity, ForceMode.VelocityChange);
             boosts -= 1;
             GUIManager.SetBoosts(boosts);
         }
     }
     distanceTraveled = transform.localPosition.x;
     GUIManager.SetDistance(distanceTraveled);
     
     if(transform.localPosition.y < gameOverY){
         GameEventManager.TriggerGameOver();
     }
 }

 void FixedUpdate () {
     if(touchingPlatform){
         rigidbody.AddForce(acceleration, 0f, 0f, ForceMode.Acceleration);
     }
 }

 void OnCollisionEnter () {
     touchingPlatform = true;
 }

 void OnCollisionExit () {
     touchingPlatform = false;
 }

 private void GameStart () {
     boosts = 0;
     GUIManager.SetBoosts(boosts);
     distanceTraveled = 0f;
     GUIManager.SetDistance(distanceTraveled);
     transform.localPosition = startPosition;
     renderer.enabled = true;
     rigidbody.isKinematic = false;
     enabled = true;
 }
 
 private void GameOver () {
     renderer.enabled = false;
     rigidbody.isKinematic = true;
     enabled = false;
 }
 
 public static void AddBoost(){
     boosts += 1;
     GUIManager.SetBoosts(boosts);
 }

}

And here is my other code...

using UnityEngine; using System.Collections;

public class Jump : MonoBehaviour {

 void OnMouseDown(){
     Runner.GetComponent<Runner>().Press = true;
 }

 void OnMouseUp(){
     Runner.GetComponent<Runner>().Press = false;
 }

}

Unity Keeps giving my this error:

Assets/Jump.cs(7,24): error CS0120: An object is required to access non-static member 'UnityEngine.Component.GetComponent(System.Type)'

Assets/Jump.cs(11,24): error CS0120: An object is required to access non-static member 'UnityEngine.Component.GetComponent(System.Type)'

Thanks in advanced!