Soundkung 

Before Windows 10,i was a Windows 7 user,but i didn't upgrade to Windows 10,i got it from Windows 10 installation disk,rather than risk upgrading it,it would be safe to install clean Windows 10. Don't forget to back up all the data on your computer.

From Windows 7 to Windows 10,all upgrades are free and also very safe.

Rather than risk upgrading it,it would be safe to install clean Windows 10.
I think that is right,in my opinion the loss of Windows upgrade failure is also unpredictable.

Sal78 

Rather than risk upgrading it,it would be safe to install clean Windows 10. I think that is right,in my opinion the loss of Windows upgrade failure is also unpredictable.

About upgrading to Windows 10:
https://www.windows10passwordreset.com/free-upgrade-to-windows-10.html
About do a clean Windows 10 installation:
https://www.howtogeek.com/224342/how-to-clean-install-windows-10/