You have 30 days to downgrade or revert to your previous OS. Windows 10 may not be for everyone. Im not saying this because is not user friendly or difficult to navigate, Im saying this because Win 10 might not be compatible with all your peripherals like printer, webcam or Apps and Programs.
Here is how you revert to the previous OS:
Click on start then Settings.
Navigate to Update & security.
Select Recovery from the left pane and on the right look for the Go back to Windows XX, should say something like Windows 7 or 8.1 depending on your previous OS.
Click on Get started and follow the prompts to go through the restore process.
Once complete you’ll ind yourself using the previous OS before upgrading to Windows 10