Could you please try the CrystalHD for Windows link on this page please:
https://www.broadcom.com/support/download-search/?pg=Legacy+Broadcom&pn=BCM70012;BCM70015
I
think it'll be the same as the one for the BCM70010, so try and extract the zip file and see if that driver can be used
. I extracted it on my machine and there's a 32 bit and 64 bit version included, and you can either manually point Windows 10 to select that driver via device manager - or use the setup.exe file. You may have more luck pointing device manager to pick up the driver from the appropriate 32 or 64 bit subfolder.