OSXWiFi stole my money. I've sent them 5 emails now to both their sales and support emails and they don't respond.
Wow that's really bad form, they did help me when I first got the card (but only after I'd whinged about their slackness in another thread on this forum!!), but even then the email turnaround time took AGES, I reckon it was about two months of mucking about before they finally provided a solution.
I hope you paid through Paypal. Maybe you can lodge a refund claim?
My Broadcom card uses a USB connection for Bluetooth. You may want to double check the the USB connection
Am going to pull the card out and reseat this afternoon, fingers crossed it's just something simple like the USB being loose, weird that it's still working fine in Yosemite though, just not El Capitan - I suspect it's something to do with the firmware/drivers/kexts, though I've no idea how to deal with that if it is - that's why I bought a dongle just in case.
Actually does anyone know if I can use the card with Yosemite on one boot disc and the dongle with El Capitan on the other boot disc? I realise I will have to run CAT to get the dongle working on El Capitan, but don't know if I'll have to switch to the dongle and use CAT also in Yosemite.
I've uploaded the CAT system report for El Capitan, just in case anyone can help. The section saying my "hardware doesn't support Bluetooth 4.0 necessary for Continuity Current LMP Version=0, expected 6" is odd - in Yosemite the LMP version is 6.