The downgrading to your older OS requires that you still have your Windows.old folder at C:\Windows.old. If you typically delete that after upgrading, or you’ve done a post-upgrade clean install of Windows 10, you will not downgrade.
If this is an OEM system then you can use the proprietary software and reset the system to factory settings (like new). The procedure for this varies from maker to maker so your exact make/model for your PC is required for us to point you in the right direction.
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