1) Launch Logic Pro and navigate to Logic Pro -> Preferences -> Plug-in Manager.
2) Make sure BIAS FX 2 is in the list and the check box is ticked.
3) If BIAS FX 2 is not in the list, but the file BIAS FX2.components does exist in the location
Mac HD/Library/Audio/Plug-ins/Components/, please try the the steps below :
*If you've performed all the steps above but still failed to see BIAS FX 2 plugin in Logic, please reboot your Mac and open Logic again to see if it works.