diff --git a/source/__init__.py b/source/__init__.py
index 5dc7a50..b536c58 100644
--- a/source/__init__.py
+++ b/source/__init__.py
@@ -19,6 +19,7 @@ def __init__(self):
         self.ctconfig = CT_Config()
         self.ctconfig.load_ctconfig_file("./ct_config.json")
 
+        self.is_dev_version = False  # Is this installer version a dev ?
         self.stringvar_language = StringVar(value=self.option["language"])
         self.stringvar_game_format = StringVar(value=self.option["format"])
         self.boolvar_disable_download = BooleanVar(value=self.option["disable_download"])
@@ -36,8 +37,6 @@ def __init__(self):
         self.root.iconbitmap(bitmap="./icon.ico")
 
         if not(self.boolvar_dont_check_for_update.get()): self.check_update()
-        self.path_mkwf = None
-
 
         self.menu_bar = Menu(self.root)
         self.root.config(menu=self.menu_bar)
diff --git a/source/check_update.py b/source/check_update.py
index c407020..f2cce4d 100644
--- a/source/check_update.py
+++ b/source/check_update.py
@@ -13,15 +13,15 @@ def check_update(self):
         with open("./version", "rb") as f:
             locversion = json.load(f)
 
-        if ((float(gitversion["version"]) > float(locversion["version"])) or
-           (float(gitversion["version"]) == float(locversion["version"])) and
+        if ((float(gitversion["version"]) > float(locversion["version"])) or   # if github version is newer than
+           (float(gitversion["version"]) == float(locversion["version"])) and  # local version
                 float(gitversion["subversion"]) > float(locversion["subversion"])):
             if messagebox.askyesno(
                     self.translate("Update available !"),
                     self.translate("An update is available, do you want to install it ?",
-                    f"\n\nVersion : {locversion['version']}.{locversion['subversion']} -> "
-                    f"{gitversion['version']}.{gitversion['subversion']}\n"
-                    f"Changelog :\n{gitversion['changelog']}")):
+                                   f"\n\nVersion : {locversion['version']}.{locversion['subversion']} -> "
+                                   f"{gitversion['version']}.{gitversion['subversion']}\n"
+                                   f"Changelog :\n{gitversion['changelog']}")):
 
                 if not(os.path.exists("./Updater/Updater.exe")):
                     dl = requests.get(gitversion["updater_bin"], allow_redirects=True)
@@ -38,6 +38,11 @@ def check_update(self):
                     print(self.translate("starting application..."))
                     os.startfile(os.path.realpath("./Updater/Updater.exe"))
 
+            if ((float(gitversion["version"]) < float(locversion["version"])) or        # if local version is newer than
+                    (float(gitversion["version"]) == float(locversion["version"])) and  # github version
+                    float(gitversion["subversion"]) < float(locversion["subversion"])):
+                self.is_dev_version = True
+
     except requests.ConnectionError:
         messagebox.showwarning(self.translate("Warning"),
                                self.translate("Can't connect to internet. Download will be disabled."))
diff --git a/source/definition.py b/source/definition.py
index b749f22..08035e5 100644
--- a/source/definition.py
+++ b/source/definition.py
@@ -1,7 +1,10 @@
 CREATE_NO_WINDOW = 0x08000000
 GITHUB_REPOSITORY = "Faraphel/MKWF-Install"
-GITHUB_CONTENT_ROOT = f"https://raw.githubusercontent.com/{GITHUB_REPOSITORY}/master/"
-VERSION_FILE_URL = GITHUB_CONTENT_ROOT + "version"
+GITHUB_MASTER_BRANCH = f"https://raw.githubusercontent.com/{GITHUB_REPOSITORY}/master/"
+GITHUB_DEV_BRANCH = f"https://raw.githubusercontent.com/{GITHUB_REPOSITORY}/dev/"
+VERSION_FILE_URL = GITHUB_MASTER_BRANCH + "version"
+
+get_github_content_root = lambda self: GITHUB_DEV_BRANCH if self.is_dev_version else GITHUB_MASTER_BRANCH
 
 get_filename = lambda file: ".".join(file.split(".")[:-1])
 get_nodir = lambda file: file.replace("\\", "/").split("/")[-1]
diff --git a/source/get_github_file.py b/source/get_github_file.py
index 02361e7..b035286 100644
--- a/source/get_github_file.py
+++ b/source/get_github_file.py
@@ -9,7 +9,7 @@ def get_github_file(self, file):
         returncode = 0
         if self.boolvar_disable_download.get(): return 2
 
-        dl = requests.get(GITHUB_CONTENT_ROOT+file, allow_redirects=True, stream=True)
+        dl = requests.get(get_github_content_root(self)+file, allow_redirects=True, stream=True)
         if os.path.exists(file):
             if int(dl.headers['Content-Length']) == os.path.getsize(file): return 1
             else: returncode = 3
diff --git a/source/install_mod.py b/source/install_mod.py
index aedae4c..11f3e26 100644
--- a/source/install_mod.py
+++ b/source/install_mod.py
@@ -132,4 +132,6 @@ def install_mod(self):
     t = Thread(target=func)
     t.setDaemon(True)
     t.start()
-    return t
\ No newline at end of file
+    return t
+
+# TODO: use wszst module instead of subprocess