Yesterday I upgraded successfully my new 64gb dual boot Vi10 pro without any issues.
I tried the in-place upgrade.
The Get Windows 10 app didn’t work, so i used the media creation tool
selecting Download Tool Now
After tool installation choose “Upgrade my PC now”,no need to create a bootable usb or disk ,and let it to do the job.
You can even choose to keep your apps and data from Windows 8.1 to Windows 10.