I've followed the instructions here : https://support.apple.com/en-au/HT204990
I have a late 2013 MacBook Pro Retina. Currently running Windows 7 64bit. I've got the latest OS X 10.11 El Capitan, all software updates applied. I've run the Apple Software Update in Windows 7 – all up to date.
When I click on the Get Windows 10 icon, it displays:
"Unfortunately, this PC is unable to run Windows 10… because one or more things are incompatible.
Viewing the report, it says:
"The device manufacturers haven't made these devices compatible with Windows 10, so they won't work. Check with the manufacturers for support."
Apple Broadcom Built-in Bluetooth
Apple Inc.
Best Answer
Try updating the bluetooth driver using the one found here: http://support.lenovo.com/au/en/downloads/ds031759
It should have the supported Windows 10 driver for the Bluetooth chipset found in that model (BCM20702).
Once completed, try the upgrade again.