My first suggestion is and will always be....
Create a disk image of your Hard Disk before proceeding any further.
https://www.windows10forums.com/threads/please-for-your-own-peace-of-mind.794/
Then if you have any third party security suites installed, uninstall them completely (you cannot truly disable them, so don't bother) use the Programs and Features applet in the Control Panel to Uninstall them and then google for their vendor specific, proprietary removal tool and use that also (AVG Removal Tool, Norton Removal Tool, McAfee Removal Tool.... you get the idea).
Next.... minimalize your hardware by disconnecting any and all peripheral devices. Especially any USB Dongles supporting wireless devices like wireless keyboards, wireless mice, wireless network adapters, etc.
Perform the in-place upgrade from a local resource (forget about the on-line upgrade.
Get the installation media in hand.
The installation media can be obtained through either of these two resources.
https://www.microsoft.com/en-us/software-download/techbench
OR
http://www.microsoft.com/en-us/software-download/windows10
Once you have the ISO, you can use ImgBurn to burn it to a DVD or Rufus to burn it to a USB ThumbDrive, either of which you can use to perform the in-place upgrade by simply double clicking the setup.exe program on the media from within your running OS.