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.

Unity uses PlayerSettings.bundleVersion on all platforms, so Application.version returns that same version string at runtime.

using UnityEngine;

public class ApplicationVersionExample : MonoBehaviour
{
    void Start()
    {
        //This will print whatever is in Edit>Project Settings>Player>Version (by default 0.1)
        Debug.Log("Application Version : " + Application.version);
    }
}