Are you using an ethernet cable or wireless to connect your computer to the router? An ethernet cable connection is faster and more reliable for large downloads. An ethernet cable is an inexpensive purchase.
Disable your anti-virus whilst upgrading.
I suggest you download the Windows 10 Media creation tool ISO and do an In-place upgrade.
Download the updated Windows 10 Media creation Tool Build 10586:
http://www.microsoft.com/en-us/software-download/windows10
How to download an ISO using Media creation Tool:
http://www.tenforums.com/tutorials/9230-windows-10-iso-download.html
How to perform an In Place upgrade using Method 1:
http://www.tenforums.com/tutorials/16397-repair-install-windows-10-place-upgrade.html#step6
If that does not work please provide more information to enable your problem to be diagnosed.
Please restart your computer and allow 20 minutes for the system to run before uploading information. When examining Event Viewer log files many, not all, problems show in the period immediately after the computer has been booted.
Please provide a copy of your System Information file. To access your System Information file select the keyboard shortcut Win+R, type msinfo32 and click OK . Place the cursor on System Summary. Select File, Export and give the file a name noting where it is located. Click Save**.Do not place the cursor within the body of the report before exporting the file.** The system creates a new System Information file each time system information is accessed. You need to allow a minute or two for the file to be fully populated before exporting a copy. Please upload the file to your OneDrive, share with everyone and post a link here. If the report is in a language other than English, please state the language.
Please upload to your OneDrive and share with everyone a copy of your System log file **** from your Event Viewer and post a link here. Please remove any earlier copies of the logs from your OneDrive.
To access the System log select the keyboard shortcut Win+R, type eventvwr.msc and press the ENTER key. From the list in the left side of the window select Windows Logs and System. Place the cursor on System, select Action from the Menu and Save All Events as (the default evtx file type) and give the file a name. Do not provide filtered files. Do not place the cursor in the list of reports before selecting Action from the menu. Do not clear logs whilst you have a continuing problem.
For help with OneDrive see paragraph 9.3: