Unityで再生ボタンを押すたびにプロジェクトのバージョンを上げるスクリプト。Editorフォルダに入れて使ってください。

AutoVersion.cs

using UnityEditor;
using System.Linq;

namespace Ruccho.Utilities
{
    public class AutoVersion
    {
        
        [InitializeOnLoadMethod]
        private static void RegisterEditorIncrementEvent()
        {
            EditorApplication.playModeStateChanged += (x) =>
            {
                if (x == PlayModeStateChange.ExitingEditMode)
                {
                    string currentVersion = PlayerSettings.bundleVersion;
                    string[] digits = currentVersion.Split('.');
                    
                    string last = digits[digits.Length - 1];
                    
                    int lastParsed;
                    string added;
                    if (int.TryParse(last, out lastParsed))
                    {
                        lastParsed++;
                        added = string.Join(".", digits.Take(digits.Length - 1));
                    }
                    else
                    {
                        lastParsed = 0;
                        added = currentVersion;
                    }

                    added += "." + lastParsed.ToString();
                    
                    PlayerSettings.bundleVersion = added;

                }
            };

        }
    }
}