diff --git a/aqt/archives.py b/aqt/archives.py
index 7f5774a..be02b6b 100644
--- a/aqt/archives.py
+++ b/aqt/archives.py
@@ -752,6 +752,12 @@ class ToolArchives(QtArchives):
         update_xmls = [UpdateXmls(os_target_folder, update_xml_text)]
         self._parse_update_xmls(update_xmls, None)
 
+    def _main_repo_folder(self, os_segment: str, name: str) -> str:
+        """Build the main repository folder path for Updates.xml."""
+        if name == "tools_ifw" and self.tool_version_str != "tools_ifw47":
+            return posixpath.join("online/qtsdkrepository", os_segment, "ifw", self.tool_version_str)
+        return posixpath.join("online/qtsdkrepository", os_segment, self.target, name)
+
     def _parse_update_xml(self, os_target_folder: str, update_xml_text: str, *ignored: Any) -> None:
         update_xml = Updates.fromstring(self.base, update_xml_text)
         self._append_tool_update(os_target_folder, update_xml, self.arch, self.tool_version_str)
diff --git a/tests/test_tools_archives.py b/tests/test_tools_archives.py
new file mode 100644
index 0000000..a58c6e8
--- /dev/null
+++ b/tests/test_tools_archives.py
@@ -0,0 +1,66 @@
+import os
+
+import pytest
+
+from aqt.archives import ToolArchives
+from aqt.helper import Settings
+
+
+@pytest.fixture(autouse=True)
+def setup_settings():
+    Settings.load_settings(os.path.join(os.path.dirname(__file__), "data", "settings.ini"))
+
+
+def _stub_download_xml(self, *args, **kwargs):
+    # Minimal valid Updates XML content; parsing is bypassed in these tests
+    # because we monkeypatch _parse_update_xml.
+    return "<Updates></Updates>"
+
+
+@pytest.mark.parametrize(
+    "os_name,target,tool_name,tool_version,expected_path",
+    [
+        (
+            "linux",
+            "desktop",
+            "tools_ninja",
+            None,
+            "online/qtsdkrepository/linux_x64/desktop/tools_ninja",
+        ),
+        (
+            "linux",
+            "desktop",
+            "tools_ifw",
+            "tools_ifw410",
+            "online/qtsdkrepository/linux_x64/ifw/tools_ifw410",
+        ),
+        (
+            "linux",
+            "desktop",
+            "tools_ifw",
+            "tools_ifw47",
+            "online/qtsdkrepository/linux_x64/desktop/tools_ifw",
+        ),
+    ],
+)
+def test_tool_archives_repo_folder(monkeypatch, os_name, target, tool_name, tool_version, expected_path):
+    # Capture the target folder passed to _parse_update_xml
+    captured = {}
+
+    def _capture_parse(self, os_target_folder, update_xml_text, *ignored):
+        captured["folder"] = os_target_folder
+        # Do nothing else; skip actual parsing for this test.
+        return None
+
+    # Avoid any network/file IO and ensure our capture is invoked
+    monkeypatch.setattr(ToolArchives, "_download_update_xml", _stub_download_xml)
+    monkeypatch.setattr(ToolArchives, "_parse_update_xml", _capture_parse)
+
+    # Create the ToolArchives instance; __init__ triggers _get_archives()
+    ToolArchives(os_name=os_name, target=target, tool_name=tool_name, base=Settings.baseurl, version_str=tool_version)
+
+    assert captured["folder"] == expected_path
+
+    # And that, when combined with base, it forms the expected URL root
+    expected_url = f"{Settings.baseurl}/{expected_path}"
+    assert expected_url.startswith("http")