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:
Are you doing a (wiping the drive) or an upgrade (keeping files)? windows-10-20h2-full-iso-may-2021-kuyhaa
What is your main for using this specific 2021 version (e.g., compatibility, troubleshooting)? Press Win + R , type winver ,
Ensure all hardware drivers are updated, especially chipset and graphics. Press Win + R
Enter a product key or click "I don't have a product key" (you can activate later).