Microsoft today released Windows 10 in version 20H2 on the Release Preview channel. The feature update became available as an activation package named KB4562830.
This is the final stage of testing before the operating system is distributed to everyone.
The 20H2 version will be available on devices currently running Windows 10 2004 using the KB4562830 activation package. It's the same technology that Microsoft used to upgrade from Windows 10 1903 to 1909.
If your device is set to receive updates from the Release Preview channel, just try pressing the Check for Updates button and you will see if the update is available for your device.
Windows Insiders can download an ISO image of version 20H2 of Windows 10 from official webpage
The 20H2 version of Windows 10 is a small update with performance and quality improvements.