Soon after Windows build 21345 was released to the Dev channel for insiders, Microsoft also made available the iso of this versions. So, if you are interested in installing this build from scratch, you can download the ISO image.
Windows 10 build 21345 is a release from a newer OS, co_release (cobalt release or Cobalt release), which belongs to Windows 21 version 2H10.
Major changes in this version include new personalization options, new settings screens, new camera options and more.
Also, the MS Paint and the Snipping Tool will now receive updates from Microsoft store. The latter will also be integrated into the Snip and Sketch Store pages.
To carry out a clean installation of the latest version of Windows, you will need to download the ISO.
Sign in to your Microsoft Account that you're connected to connected to Windows Insider from here.
Select "Build 21345" from the list of available versions, select a language and download the file to your computer.
Along with the ISO above there are all the following in the Windows 10 channel insider preview:
Dev Channel - build 20231
Beta Channel - build 19043
Release Preview - 19043
Dev Channel Enterprise Edition – 21345
Beta Channel Enterprise Edition - 19043
Release Preview Enterprise Edition - 19043
Dev Channel Home China - 21345
Dev Channel Home China - 19043
Release Preview Home China - 19043