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Nov 1, 2015 4:29 AM in response to WHATAby Loner T,From your link ...
"You’ll need to perform a clean install to get to the 64-bit version of Windows 10 from the 32-bit one. There’s no upgrade path."
From Apple's Use Windows 10 on your Mac with Boot Camp - Apple Support,
Upgrading from 32-bit versions of Windows
If you have an existing 32-bit installation of Windows on your Mac, you'll need to back up your important files so that you can remove the existing Windows partition and install a 64 bit version of Windows.
- Back up any important files from your Windows partition.
- Use Boot Camp Assistant to remove the existing Windows partition.
- Then, use Boot Camp Assistant to install a 64-bit version of Windows 10 on your Mac.
- After you're finished installing Windows, copy your important files back to your Windows drive.
Is your Mac on the supported list of Macs provided by Apple in the previous link?
I don't want to deactivate my windows.
The first successful W10 installation/upgrade registers your computer with Microsoft. You can install/re-install W10 as often as you like on the same computer.