Microsoft released KB4529943 yesterday to devices that participate in the Unified Update Platform preview. The update will be released later to devices that run Windows 10 and don't participate in the UUP preview program.
The company revealed in November 2016 that it had plans to switch the update delivery system of the Windows 10 operating system to the Unified Update Platform in order to reduce the size of average updates and improve the delivery and deployment time of updates that it releases for Windows 10.
The new method could reduce the size of updates by up to 35% according to Microsoft. The new platform uses differential packages to send only the bits that have changed to customer devices and not everything.
A differential download package contains only the changes that have been made since the last time you updated your device, rather than a full build. As we rollout UUP, this will eventually be impactful for PCs where users can expect their download size to decrease by approximately 35% when going from one major update of Windows to another.
KB4529943 -- update for Unified Update Platform for Windows 10, version 1903: November 7, 2019 -- is now made available to customers participating in the UUP test. Microsoft notes that the update should only be installed on devices that participate in the test and not on devices that don't. It is theoretically possible to download the update from the Microsoft Update Catalog website to install it on systems that are not participating.
This update has been made available on a limited basis to customers participating in a preview of Unified Update Platform (UUP). It is currently in a test phase and should only be installed on devices enrolled in the UUP preview.
Microsoft will update the Knowledge Base article when the update is being made available for non-preview customers.
A reduction in update size should be beneficial to the majority of users and organizations that use Windows 10. Updates should be delivered faster and most users may also notice improvements in update installations.
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