diff --git a/requirements.txt b/requirements.txt
index ff2bf94..2057569 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,3 +1,4 @@
 aiohttp==3.8.1
 appdirs~=1.4.4
-aiofiles~=0.8.0
\ No newline at end of file
+aiofiles~=0.8.0
+aiopath~=0.6.10
\ No newline at end of file
diff --git a/worthless/installer.py b/worthless/installer.py
index a571090..02d70b6 100644
--- a/worthless/installer.py
+++ b/worthless/installer.py
@@ -1,16 +1,28 @@
-import asyncio
-import tarfile
-import constants
-import appdirs
-import aiofiles
+import re
 from pathlib import Path
-import shutil
-import aiohttp
-from worthless.launcher import Launcher
 from configparser import ConfigParser
+from worthless.launcher import Launcher
 
 
 class Installer:
+    def _read_version_from_config(self):
+        if self._config_file.exists():
+            raise FileNotFoundError(f"Config file {self._config_file} not found")
+        cfg = ConfigParser()
+        cfg.read(str(self._config_file))
+        return cfg.get("miHoYo", "game_version")
+
+    # https://gitlab.com/KRypt0n_/an-anime-game-launcher/-/blob/main/src/ts/Game.ts#L26
+    def _read_version_from_game_file(self):
+        globalgamemanagers = self._gamedir.joinpath("./GenshinImpact_Data/globalgamemanagers")
+        if globalgamemanagers.exists():
+            with globalgamemanagers.open("rb") as f:
+                data = f.read().decode("ascii")
+            result = re.search(r"([1-9]+\.[0-9]+\.[0-9]+)_[\d]+_[\d]+", data)
+            if not result:
+                raise ValueError("Could not find version in game file")
+            return result.group(1)
+
     def __init__(self, gamedir: str | Path = Path.cwd(), overseas: bool = True):
         if isinstance(gamedir, str):
             gamedir = Path(gamedir)
@@ -22,12 +34,6 @@ class Installer:
         self._launcher = Launcher(self._gamedir, self._overseas)
         if config_file.exists():
             self._version = self._read_version_from_config()
-        else:  # TODO: Use An Anime Game Launcher method (which is more brutal, but it works)
-            self._version = "mangosus"
+        elif gamedir.joinpath("./GenshinImpact_Data/globalgamemanagers").exists():
+            self._version = self._read_version_from_game_file()
 
-    def _read_version_from_config(self):
-        if self._config_file.exists():
-            raise FileNotFoundError(f"Config file {self._config_file} not found")
-        cfg = ConfigParser()
-        cfg.read(str(self._config_file))
-        return cfg.get("miHoYo", "game_version")
diff --git a/worthless/patcher.py b/worthless/patcher.py
index ae21055..fb3d2e4 100644
--- a/worthless/patcher.py
+++ b/worthless/patcher.py
@@ -18,7 +18,7 @@ class Patcher:
             self._temp_path = Path(self._appdirs.user_cache_dir)
         else:
             if not isinstance(data_dir, Path):
-                override_data_dir = Path(data_dir)
+                data_dir = Path(data_dir)
             self._patch_path = data_dir.joinpath("Patch")
             self._temp_path = data_dir.joinpath("Temp")