Application.version

Description

Returns application version number (Read Only).

This function returns the current version of the Application. This is read-only. To set the version number in Unity, go to Edit > Project Settings > Player.

using UnityEngine;

public class ApplicationVersionExample : MonoBehaviour
{
    // Use this for initialization
    void Start()
    {
        //Ouput the current Application version into the Console
        Debug.Log("Application Version : " + Application.version);
    }
}