I can't download the BootCamp support drivers (OS X 10.11.2)
I'm on a Mid 2012 Macbook Pro w/ Retina and El Capitan 10.11.2.

I was able to do boot camp assistant > download drivers (no other options selected) Bootcamp would ask for a usb drive, ignore it and close the pop up. From here I took my mouse up to the menu bar, and did Action > Download Windows Support Software.

The first time I tried this I got the error "The Windows support software could not be saved to the selected drive. An error occured while saving the Windows support software".

The second time I tried it, a day later with a reboot, I tried it again and it worked. Not sure what made the difference. Finder might have not been running as I'm running a trial version of Path Finder.