diff --git a/unsloth_cli/commands/studio.py b/unsloth_cli/commands/studio.py
index d0d6e308c1..74f52feecc 100644
--- a/unsloth_cli/commands/studio.py
+++ b/unsloth_cli/commands/studio.py
@@ -133,6 +133,26 @@ def _windows_hidden_subprocess_kwargs() -> dict[str, object]:
     return kwargs
 
 
+def _stream_for_subprocess(stream):
+    """Return *stream* if it has a real OS file descriptor, else None.
+
+    subprocess.run on Windows refuses to inherit std handles unless
+    they're passed explicitly (otherwise close_fds=True forces
+    bInheritHandles=False, and a CREATE_NO_WINDOW child ends up with
+    no stdio at all). When sys.stdout / sys.stderr is a real fd-backed
+    stream we want to hand it through; when it's been captured by a
+    test harness (pytest's capsys, an in-memory wrapper, etc) we fall
+    back to None so subprocess uses its default.
+    """
+    if stream is None:
+        return None
+    try:
+        stream.fileno()
+    except (AttributeError, OSError, ValueError):
+        return None
+    return stream
+
+
 def _studio_venv_python() -> Optional[Path]:
     """Return the studio venv Python binary, or None if not set up."""
     if platform.system() == "Windows":
@@ -1015,9 +1035,26 @@ def _run_setup_script(*, verbose: bool = False) -> None:
                 f"& '{script_pwsh_literal}' *>&1",
             ]
         )
+        # Explicitly hand stdin/stdout/stderr to the child so the
+        # CI tee actually sees setup.ps1's output. Without this,
+        # subprocess.run on Windows uses close_fds=True (default,
+        # since Python 3.7) which sets bInheritHandles=False on
+        # CreateProcess. With CREATE_NO_WINDOW also set (via
+        # _windows_hidden_subprocess_kwargs in non-TTY runs), the
+        # child has neither a console nor any inherited std
+        # handles, so PowerShell's Write-Host -- and even
+        # [Console]::Out.WriteLine -- writes to nothing. Passing
+        # stdout=sys.stdout / stderr=sys.stderr makes Python set up
+        # PROC_THREAD_ATTRIBUTE_HANDLE_LIST with the std handles
+        # explicitly inheritable, which works alongside
+        # CREATE_NO_WINDOW. Empty update.log on the windows-latest
+        # CI was the smoking gun (run 25533694490 and 25534292239).
         result = subprocess.run(
             powershell_args,
             env = env,
+            stdin = _stream_for_subprocess(sys.stdin),
+            stdout = _stream_for_subprocess(sys.stdout),
+            stderr = _stream_for_subprocess(sys.stderr),
             **_windows_hidden_subprocess_kwargs(),
         )
     else: