Windows 10 Pro 21H2 Build 19044.1263 Lite x64 September 2021 | Windows x64 | File Size: 1.5 GB Windows 10, version 21H1 is a scoped set of features for select performance improvements, enterprise features, and quality enhancements. As an H1-targeted release, 21H1 is serviced for 18 months from the release date for devices running Windows 10 Enterprise or Windows 10 Education editions.