Microsoft has the KB4562830 Feature Enablement Package Windows 10 20H2 (2009) now officially on its servers.
The first drivers for the Windows 10 20H2 are certified, so everything works like it should be up on release to the public.
The update will be available soon over windows update. Its expected to be released to the public at the end of this month.
in case you really can’t wait anymore for the official release, you can use these official links to the Microsoft servers so you can download the update manually.