I have solved changing registry key:

Computer\HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\WindowsUpdate\OSUpgrade

Item AllowOSUpgrade (DWORD32) to 1
then restart upgrade process.

Info from:
http://www.keyforweb.it/windows-10-risolvere-lerrore-0x80070002-0x20016-che-impedisce-lupgrade/