Microsoft has released the official ISO images for Windows 10 version 21H2 for them Insiders (build 19044.1202). Η ίδια έκδοση είναι προς το παρόν διαθέσιμη και στο Release Preview channel. So now you can download the ISO you are interested in and do a clean install of the latest version of Windows 10.
Release Preview builds are pretty stable. Despite being a pre-release version, it has changes compared to the current “stable” version. As with the 20H2 and 21H1 versions, the new edition 21H2 will be a small cumulative update for Windows 10 version 2004 with a few minor tweaks. All of the aforementioned versions of Windows 10 share the same code base.
Thus, Windows 10 of version 21H2 is based on the same code as versions 2004, 20H2 and 21H1. In addition, all changes from 20H2, 21H1 and 21H2 were added to the 2004 version with cumulative updates. They are just hidden and need to be activated with one packet "Activation". So it is very likely that the upgrade to version 21H2 at this time will not affect the user experience.
To download the ISO you are interested in, sign in with your Microsoft Account and Insider Program from here.
Select build "19044.1202" from the list of available versions.
Select the desired language, e.g. Greek and confirm your choice.
Then you can download the ISO file to 32 or 64-bit.