Press Win + R , type winver , and press Enter to verify you are on version 20H2 . To make this guide more actionable, could you let me know:
Select Custom: Install Windows only (advanced) for a clean install. windows-10-20h2-full-iso-may-2021-kuyhaa
Enter a product key or click "I don't have a product key" (you can activate later). Press Win + R , type winver ,
Are you doing a (wiping the drive) or an upgrade (keeping files)? Press Win + R