Windows insider received a new build 3 days ago in Fast access channel. The update carries fixes for a few issues, but there are still some problems in the list that have not been resolved. You can read the changelog.
Unlike conventional, cumulative updates have been integrated into Windows 10 19551.1005. KB4538791, KB4538792, KB4538793, KB4538795 and the KB4538794 released as dynamic updates. The first one takes Windows 10 20H2 to 19551.1001. Here we are with the ISO files. Download anyone of your use and install on your machine.
Download Windows 10 Build 19551 ISO
Here are Windows 10 Build 19551 20H2 ISO –