Driver appears to load but there is no entry in /dev for the device RS 232 adaptor.
I am using the latest VCP driver. In system report usb ser! is the indication when the adaptor is plugged in.
Interestingly enough, the FTDI site has drivers that are to be used with El Capitan which I tried on my MacBook Pro
and even using the helper software the site suggested I had the same result.
i.e. apparent success but no driver is loaded.
OBS MacBook (13-inch Early 2008), Mac OS X (10.7.5)