RE: Dell Inspiron 15R 7520 SE - Windows 10 64 Bit WiFi Driver not available on Dell Site
I've been experiencing the same issues. To be more accurate, if my computer went to sleep, I would lost the wifi connection until the next reboot. I just installed the Win 8.1 64 driver from this page:
and my issues seem to be fixed.
@Todd: I think you provided the link to the Bluetooth driver only and won't help here.