Build 21390 is the "missing link" in Windows evolution. It has the heart of Windows 10 (no centered taskbar, no rounded corners, no Widgets panel) but the soul of Windows 11 (iconography, animations, Terminal focus).
In warez and insider archive communities, "Incl" usually means Included . A full "ISO Incl" release typically includes:
+-------------------------------------------------------------------------+ | WINDOWS 10 BUILD 21390 HIGHLIGHTS | +-----------------------------------+-------------------------------------+ | Feature | Description | +-----------------------------------+-------------------------------------+ | Fluent Task Manager Icon | Modernized UI aesthetic alignment | | Fluent MSI Installer Icon | Updated Windows Installer package | | Native Windows Terminal Default | Set Terminal as default host | | Advanced Display Settings | HDR Certification validation page | +-----------------------------------+-------------------------------------+ 1. Fluent Design Iconography
Fixed an issue where the Korean IME would drop characters in certain UWP apps. Architecture Breakdown: x86 vs. x64 Windows 10 Insider Preview Build 21390 -x86 X64- ISO Incl
Today, we’re taking a look at , available now in both x86 and x64 ISO formats for archival and testing purposes.
: This was the last build where the Windows 8-era Live Tiles were fully present before they were replaced by the static "Pinned" apps and Widgets in Windows 11. A "Hybrid" Visual State
Choose the specific edition (Home or Pro) that matches your compiled ISO. Build 21390 is the "missing link" in Windows evolution
Resolved a series of svchost.exe crashes tied to the cdp.dll file that caused the Start menu to freeze or crash entirely. ⚠️ Important Considerations: Timebombs & Dead Ends
Building upon previous branch improvements, the OS integrated display badges directly inside Settings > System > Display > Advanced display settings . For creative professionals, it refined controls over Content Adaptive Brightness Control (CABC) to maintain strict color accuracy during video editing and design workflows. The Changelog - Windows Insider Program | Microsoft Learn
The release of Windows 10 Insider Preview Build 21390 serves as a significant historical marker in the evolution of Microsoft’s operating system. Released to the Dev Channel x64 Today, we’re taking a look at ,
Create a new Virtual Machine and allocate at least and 4 GB of RAM (for x64).
Microsoft continued its effort to modernize the system interface by introducing updated Fluent Design icons.
Microsoft no longer provides official ISO downloads for these old preview builds. The only official download links are for the latest Windows 11 builds. To acquire the Build 21390 ISO, you must use trusted third-party tools that reconstruct the ISO from Microsoft servers.
The script will download the files from Microsoft and automatically compile a clean ISO file in the same folder. Method 2: Third-Party Archives
Last updated: Q2 2026 – Build 21390 remains a cult classic in the Windows community.