- Download an official CPython source archive. Do not choose the normal Windows installer; this tool needs the source ZIP or TAR archive.
- Extract this builder ZIP into a normal writable folder.
- Double-click
START_HERE.bat. - Choose 1 - Guided full workflow.
- Drag the CPython source archive into the window when requested.
- Accept the recommended options for a first build.
- Allow the prerequisite step to install or repair missing Windows tools.
- Leave the window open while compilation and regression tests run.
- Find the completed installer in the root
outputfolder.
The default public configuration builds x64, documentation, a packed EXE,
and the CPython regression tests. Test-marker branding is disabled, so a
final source release such as 3.10.20 uses the release-style label
Python 3.10.20 rather than a -test label.