Insider Preview Build 21390 -x86 X64- Iso Incl Repack: Windows 10

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Windows 10 Insider Preview Build 21390 was a significant release in the Dev Channel, serving as one of the final major previews before the transition to Windows 11. Released in May 2021, it belonged to the "Cobalt" (CO_RELEASE) branch and acted as a testing ground for visual refinements that eventually defined the modern Windows aesthetic.

: Open a hypervisor such as Oracle VM VirtualBox or VMware Workstation Player. Windows 10 Insider Preview Build 21390 -x86 X64- ISO Incl

On June 14, 2021, Microsoft began rolling out a cumulative update that brought the build number to . This update contained no new features; instead, it was designed to test Microsoft’s servicing pipeline. Users who have installed the cumulative update will see the newer .2025 version number, while the base ISO typically contains the original .1 release.

Do not use that specific ISO unless you obtained it directly from Microsoft and verified signatures/checksums; if you already downloaded it, delete it and obtain the build via official channels, or run strong malware scans in an isolated environment. : Windows 10 Insider Preview Build 21390 was

Continuing the modernization of the Windows interface, Build 21390 introduced a fresh wave of icon updates designed to align with the Fluent Design System.

Official Microsoft download links for this specific older build have been removed from the Windows Insider Preview Downloads page, which now prioritizes current Windows 11 builds. To obtain Build 21390 now, you generally have two options: On June 14, 2021, Microsoft began rolling out

: This build was the last version in the dev branch to support 32-bit (x86)