This worked for me; it might not work for you. Remember I’m just same random guy on the internet so I take no responsibility for anything that happens to your machine. Okay?

The Problem

1. Finding Bluetooth MAC Address from the command line. The btinfo command displays a lot of information about your bluetooth adapter, including it's MAC Address. To display only the Bluetooth MAC Address run btinfo with the '-a' switch. Btinfo is not available on your system out of the box. It's a part of the freeware Bluetooth command line tools suite.
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3. Select 'Bluetooth Radio' in the Devices list and click 'Properties'. In the 'Bluetooth Radio Properties' form go to 'Advanced' tab. Note the Manufacturer Id. If it is 10 (CSR) or 15 (Broadcom) then your bluetooth adapter is supported and you may try to change it's bluetooth address using Bluetooth MAC Address Changer.

As yet (5th Aug 2015) there’s no official support from Apple for Windows 10 running through Boot Camp. So, when I upgraded from Windows 8.1 to 10, I was expecting there to be a couple of issues. One of these was a lack of Bluetooth. Also getting the fn key working.

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But, it turns out to be easy to fix.

Get the Driver

The driver for Windows 8.1 works with 10, so you just need to grab that. Microsoft xbox controller for mac. Recboot for mac.

Go to https://support.apple.com/en-us/HT204048 and find your machine in the list. You want to look for the zip file download of the Boot Camp Assistant software.

For me, it was this one:

Bluetooth Adapter For Macbook Air

Download that file (it’s pretty big – 882Mb for my one) and unzip that once done.

Install the Driver

Inside the unpacked folder, go into the BootCamp folder and then into the $WinPEDriver$ folder under that.

The driver needs to be installed via device manager so just confirm that the AppleBluetoothBroadcom64 folder is there for now.

Usb Bluetooth Adapter For Mac

In Windows, open up device manager (the easiest way to do this is just hit the Windows key and type ‘device manager’ – it’ll be the first result).

Expand other devices and you should see an unknown device.

Right click it and select Update driver software.

Chose the second option on the pop up to browse your computer for the driver software.

Bluetooth Adapter For Mac Desktop

Browse to the $WinPEDriver$ from your downloads and select that. Make sure Include subfolders is checked and then click Next and Windows will install the Bluetooth driver for your Mac Book.

Follow the instructions below to determine if it is possible to change the bluetooth address of your adapter. No downloads required.

1. Click the Bluetooth icon in the system tray and select 'Open Settings'.

2. In the 'Bluetooth Settings' form go to 'Hardware tab'.

3. Select 'Bluetooth Radio' in the Devices list and click 'Properties'.

4. In the 'Bluetooth Radio Properties' form go to 'Advanced' tab.

5. Note the Manufacturer Id. if it is 10 (CSR) or 15 (Broadcom) then your bluetooth adapter is supported and you may try to change it's bluetooth address using Bluetooth MAC Address Changer.