Do you have a separate folder for Third Party Plugins?  You can assign one in PS in Preferences.  I put plugins like FP in that folder and they show up fine.  I put my folder in:   

C/3rd Party Plugins/Flaming Pear 

You see I also make a subfolder for each plugin.  Since I'm not a guru, others may have different solutions, but it works great for me.

 

“Music is harmony, harmony is perfection, perfection is our dream, and our dream is heaven”
Henri Frederic Amiel