bpo-42339: Adds note about KB2533623 to embeddable package docs (GH-23322)

diff --git a/Doc/using/windows.rst b/Doc/using/windows.rst
index 46390707e31087f96d3e109c7034bf1bd5dc0e5b..94d0591ae71692e1277a5fc5642248258f300d3f 100644 (file)
--- a/Doc/using/windows.rst
+++ b/Doc/using/windows.rst
@@ -422,6 +422,12 @@ dependants, such as Idle), pip and the Python documentation are not included.
     automatically via Windows Update, and can be detected by finding
     ``ucrtbase.dll`` in the system directory.
 
+.. note::
+
+   When running on Windows 7, Python 3.8 requires the KB2533623 update to be
+   installed. The embeddable distribution does not detect this update, and may
+   fail at runtime. Later versions of Windows include this update.
+
 Third-party packages should be installed by the application installer alongside
 the embedded distribution. Using pip to manage dependencies as for a regular
 Python installation is not supported with this distribution, though with some