downgrade windows10 to windows 8 problem

Hello,

Thank you for visiting Microsoft Community.

As per the issue description and the screen shot which you have added it seems that you might have changed some settings from Windows.old folder.

Windows.old folder located at the root of the local disk where Windows 10 is installed will be deleted after 30 days automatically. The Windows.old folder is used to facilitate the rollback. So please perform any rollback within 30 days or this option will no longer be available. If you change anything in this folder you will be unable to roll back to previous version.

For further reference you may refer to the below mentioned WIKI article.

Go back to your previous version of Windows

Frequently Asked Questions: Windows 10

Hope the information provided is helpful. Do let us know if you have any queries related to Windows, we will be happy to assist you.

thanks for replaying 

i just updated my windows tow days ago so i did not change or delete any thing from the file windows.old 

and i try the multible sulution that you provide in the lik but nothing is work with me

i hop i can downgrade i like 8.1 much more than 10