SageMath for Windows
Build files and instructions for the Cygwin-compatible build of Sage and its executable installer and auxiliary files.
You can find the latest release (for now) at https://github.com/sagemath/sage-windows/releases
Occasionally new versions of SageMath for Windows are released independently of the Sage version (e.g. to make improvements with the Windows installer itself). The changes between installer versions are listed in the changelog.