: Go to Settings > Bluetooth & devices > Add device > Bluetooth .
Forget the Sony support site (it’s dead anyway). Here is the manual override method that works 90% of the time.
Sony VGP-BMS33 Mouse Driver Utility Purpose: Assign keystrokes or functions to side buttons (not required for normal use).
Guide to the Sony VAIO Bluetooth Laser Mouse VGP-BMS33 Driver and Setup