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Hello and thank you for your question, I look forward to assisting you today. Did you do the upgrade over the internet?
The rollback is relatively straight forward. As your computer rolls back the remote connection will be lost.
To roll back your Windows 10, go to your PC Settings, by typing Settings in the taskbar search bar, next to the Windows icon, and clicking on Settings. It will open the PC Settings. Select Update and Security. There you will see options like Windows Update, Activation, Backup, Recovery and Windows Defender. Click on Recovery. This will open the Recovery settings window for your PC. You will see 3 options: Click on Go back to previous version of Windows. This will take you back to Windows 8.1