This kext not working under 10.11 simply because Apple change single value in its bluetooth kext.
To solve the problem, we need to change corresponding (your bluetooth ID) key value in BluetoothDevInfoInjector.kext/info.plist to make it compatible with 10.11.
Thanks! Version 2.8 works perfect under 10.10. My card is BCM94352.
However, bluetooth fails in Windows 8.1 when rebooted from 10.10 warm boot. Cold boot there is no problem for Windows. I suspect the bluetooth firmware is too high for Windows to recognize. Which Windows driver do you use? The broadcom official one?