Go into the BIOS and gave the Windows drive the topmost priority.
Start the Windows 10 update process. It will reboot many times, and with a little luck, you'll have Windows 10 running fine.
Check to see if Windows is activated.
Now, I suggest you to backup everything you need, and go for a fresh install of Windows. (I have run both the upgrade, and the fresh install, and I really prefer the fresh one).
Re-enter the BIOS, and again set the topmost priority to the MAC drive.
p.s. In my case, the Windows System Reserved icon in the boot menu is the one that boots me into Windows 10
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