diff --git a/gui/main.py b/gui/main.py
index ab43ec8..955d5b3 100644
--- a/gui/main.py
+++ b/gui/main.py
@@ -78,7 +78,9 @@ class UpdateThread(QThread):
     REPO_OWNER = "dazed"
     REPO_SLUG = "dazed-mtl-tool"
     REPO_BRANCH = "main"
-    ARCHIVE_ROOT = "dazed-mtl-tool"
+    # Gitea names the archive top folder after the repo display name (currently
+    # "dazedtl"). Resolve dynamically so a rename cannot silently no-op again.
+    ARCHIVE_ROOT = "dazedtl"
     SHA_FILE = str(LAST_UPDATE_SHA_PATH)
 
     # Top-level paths that should never be touched during update
@@ -117,6 +119,25 @@ class UpdateThread(QThread):
             return False
         return True
 
+    @classmethod
+    def resolve_archive_root(cls, extract_dir: Path) -> Path:
+        """Locate the single top-level folder inside an extracted archive.
+
+        Prefers ``ARCHIVE_ROOT`` when present; otherwise accepts exactly one
+        subdirectory (Gitea zip layout). Raises if the layout is unexpected.
+        """
+        preferred = extract_dir / cls.ARCHIVE_ROOT
+        if preferred.is_dir():
+            return preferred
+        dirs = sorted(p for p in extract_dir.iterdir() if p.is_dir())
+        if len(dirs) == 1:
+            return dirs[0]
+        found = [p.name for p in dirs]
+        raise FileNotFoundError(
+            f"Could not find update archive root under {extract_dir} "
+            f"(expected {cls.ARCHIVE_ROOT!r}; found {found})"
+        )
+
     @staticmethod
     def _fmt_bytes(num: int) -> str:
         if num >= 1024 * 1024:
@@ -211,16 +232,21 @@ class UpdateThread(QThread):
             with zipfile.ZipFile(zip_path, "r") as zf:
                 zf.extractall(tmp)
 
-            extracted = tmp / self.ARCHIVE_ROOT
-            root = Path(".").resolve()
+            extracted = self.resolve_archive_root(tmp)
+            root = PROJECT_ROOT.resolve()
 
             install_files = [
                 src
                 for src in extracted.rglob("*")
                 if src.is_file() and self.should_install(src.relative_to(extracted))
             ]
-            total_files = max(len(install_files), 1)
+            if not install_files:
+                raise RuntimeError(
+                    "Update archive contained no installable files "
+                    f"(root={extracted.name!r})"
+                )
 
+            total_files = len(install_files)
             self.progress.emit("Applying", 85, "Installing updated files…")
             for index, src in enumerate(install_files, start=1):
                 rel = src.relative_to(extracted)
diff --git a/tests/test_bundled_updates.py b/tests/test_bundled_updates.py
index f153f74..c6130c4 100644
--- a/tests/test_bundled_updates.py
+++ b/tests/test_bundled_updates.py
@@ -62,6 +62,67 @@ class UpdateThreadInstallFilterTests(unittest.TestCase):
                 self.assertFalse(UpdateThread.should_install(Path(rel)))
 
 
+class UpdateThreadArchiveRootTests(unittest.TestCase):
+    """Gitea zips nest files under a single top folder (repo display name)."""
+
+    def test_prefers_configured_archive_root(self):
+        from gui.main import UpdateThread
+
+        with tempfile.TemporaryDirectory() as raw:
+            base = Path(raw)
+            preferred = base / UpdateThread.ARCHIVE_ROOT
+            preferred.mkdir()
+            (base / "other").mkdir()
+            self.assertEqual(UpdateThread.resolve_archive_root(base), preferred)
+
+    def test_falls_back_to_single_subdirectory(self):
+        from gui.main import UpdateThread
+
+        with tempfile.TemporaryDirectory() as raw:
+            base = Path(raw)
+            only = base / "renamed-repo-folder"
+            only.mkdir()
+            (only / "gui").mkdir()
+            (only / "gui" / "main.py").write_text("# ok", encoding="utf-8")
+            self.assertEqual(UpdateThread.resolve_archive_root(base), only)
+
+    def test_raises_when_archive_root_missing(self):
+        from gui.main import UpdateThread
+
+        with tempfile.TemporaryDirectory() as raw:
+            base = Path(raw)
+            (base / "a").mkdir()
+            (base / "b").mkdir()
+            with self.assertRaises(FileNotFoundError):
+                UpdateThread.resolve_archive_root(base)
+
+    def test_stale_archive_root_name_would_have_installed_nothing(self):
+        """Regression: wrong ARCHIVE_ROOT used to report success with 0 files."""
+        from gui.main import UpdateThread
+
+        with tempfile.TemporaryDirectory() as raw:
+            base = Path(raw)
+            real = base / "dazedtl"
+            real.mkdir()
+            (real / "gui").mkdir()
+            (real / "gui" / "main.py").write_text("print('hi')\n", encoding="utf-8")
+            (real / "data").mkdir()
+            (real / "data" / "help").mkdir()
+            (real / "data" / "help" / "00-welcome.md").write_text("# hi\n", encoding="utf-8")
+
+            # Old hardcoded slug before the DazedTL rebrand.
+            stale = base / "dazed-mtl-tool"
+            self.assertFalse(stale.exists())
+            self.assertEqual(list(stale.rglob("*")), [])
+
+            extracted = UpdateThread.resolve_archive_root(base)
+            install_files = [
+                src
+                for src in extracted.rglob("*")
+                if src.is_file() and UpdateThread.should_install(src.relative_to(extracted))
+            ]
+            self.assertGreaterEqual(len(install_files), 2)
+
 class ShippedDataTrackingTests(unittest.TestCase):
     """Guide/help and other shipped data/ files must be git-trackable.
 
@@ -417,8 +478,11 @@ class MaintainerRefreshTests(unittest.TestCase):
                     with patch.object(forge, "_fetch_plugins", return_value=plugin):
                         self.assertTrue(forge.refresh_forge_plugins(log_fn=None))
 
-            self.assertEqual((base / "Forge_MV.js").read_bytes(), plugin)
+            # Maintainer refresh updates MZ modern only; MV stays on the legacy bundle.
+            self.assertEqual((base / "Forge_MZ.js").read_bytes(), plugin)
             self.assertEqual((upstream / "Forge_MZ.js").read_bytes(), plugin)
+            self.assertFalse((base / "Forge_MV.js").exists())
+            self.assertFalse((upstream / "Forge_MV.js").exists())
 
 
 if __name__ == "__main__":