https://wccftech.com/windows-10-version-2004-build-19041-264-kb4556803-is-out/

Microsoft has released another Windows 10 cumulative update for the upcoming May 2020 Update, version 2004. Windows 10 version 2004 Build 19041.264 (KB4556803) is now out for Insiders in the Slow and Release Preview rings, bringing a slew of improvements and security fixes.

If you installed earlier updates, only the new fixes contained in this package will be downloaded and installed on your device.