UUP Dump is widely considered the top source for downloading official Microsoft Windows files, including specialized architectures like ARM64. It downloads directly from Microsoft servers and builds the ISO locally on your machine.

After downloading the Windows 10 ARM64 ISO:

The progress bar crawled. 14%... 32%... 79%...

Microsoft does not provide a direct public download for a standalone file on its standard software download pages. Officially, Windows 10 on ARM was only available pre-installed on specific hardware or as a VHDX (Virtual Hard Disk) image for Windows Insiders . Official Channels

Historically, Microsoft only supplied Windows 10 ARM64 directly to Original Equipment Manufacturers (OEMs) to pre-install on specific hardware. However, the rise of Apple Silicon virtual machines and DIY single-board computers created a massive demand for standalone ISO installers. Top 3 Safe Methods to Download Windows 10 ARM64 ISO 1. The Windows Insider Program (Official Preview VHDX)