how to go back to your previous version of Windows ,from 10 to 7 or 8.1

You can go back to your previous version of Windows by going to

Settings > Update & security > Recovery  and selecting either Go back to Windows 7 or Go back to Windows 8.1.

Maybe a mission critical program doesn’t work properly, maybe you hate the new Start menu, or maybe that giving you the creeps.

If that sounds like you, it might be time to downgrade back to your past operating system and try again later.