AFAIK, the Apple Boot Camp support software was designed to work with Boot Camp on an Apple device for running a number of versions of Windows. I do not believe Apple supports it running directly on a Windows-based device.
However, see if the following set of steps can work for you. (Note: I don't have your exact set of equipment, so I can't verify that this will work for you.)
- If you've already added your Magic Mouse as a Bluetooth device in Windows 10 (you didn't mention which version of Windows your laptop is running,) remove it before beginning.
- Download Apple's Bootcamp Support Software here: Download Boot Camp Support Software 5.1.5769 (AM)
- Unzip the file and navigate to the following folder: bootcamp5.1.5769\Bootcamp\Drivers\Apple
- Double-click on the file AppleWirelessMouseDriver64.exe. This will install the proper driver for the Magic Mouse.
- Add your Magic Mouse under Windows 10 Bluetooth devices.
It appears from what you posted, you may have already tried these steps, but even if you have, it may be worth the time to try again. If this still doesn't work, there just may be an incompatibility issue. Regardless, you can still contact Apple Support for assistance. To do so, simply select the "Support" link on the bottom left-hand side of this forum's web page.