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Microsoft has today released the Windows 10 20H1 ISO files for clean installation. The files are out for Windows 10 version 2004 Preview Build 19041, which is the ready to manufacturing (RTM) build.

In addition to the new APIs, check out these updates to the app model, MSIX and WSL.

Windows Subsystem for Linux: The Windows Subsystem for Linux 2 is the latest and greatest version of WSL. It has significantly faster file IO performance (up to 20x faster) with full system call compatibility, meaning you can run more of the Linux apps you love (like Docker).
Hosted App Model: Applications can now declare themselves as a host for other applications via the new HostRuntime extension. These hosted apps look and behave like independent apps and can have deep Windows integration, even though they get their main executable from the host app. This technology powers PWAs on Microsoft Edge. To get started using the Hosted App Model, see this blog.
Sparse Signed Packages: Applications can now include a signed MSIX package in their existing installers and have their installers register it. This allows applications to keep their existing installers but still assign themselves identities. An identity makes the app known to Windows and allows for a more deeply integrated experience by enabling the app to call Windows APIs that require identities such as Tiles, Toasts, Notifications and BackgroundTasks.

IMPROVED DISK USAGE FOR WINDOWS SEARCH
In 19H1, Microsoft asked Insiders why they were turning off the search indexer. Your feedback helped Microsoft make improvements then and helped focus on three key areas of improvement in Windows 10 version 2004: excessive disk and CPU usage, general performance issues, and low perceived value of the indexer.

Based on this, Microsoft is introducing an algorithm that detects high disk usage and activity, so it can better identify peak usage times and manage the indexer accordingly. Microsoft is also making changes for developers to prevent searches of certain repositories and project folders to improve disk usage.

QUICK SEARCHES NOW IN SEARCH HOME
To help you find the info that matters even faster, Microsoft has added four quick web searches to your Search Home:

Weather: Get current conditions and the upcoming forecast
Top news: Read the latest headlines from popular news sites
Today in history: Explore four events that happened on this day
New movies: Find out what’s playing in theaters near you