[Kill Color Keeper v 1.2]

I installed this plugin but it's not appearing on the effects menu, why??? and yes i installed it on the right folder i already installed a bunch of plugins before i know how to install this stuff.

[Do anyone know a plugin with a effect similar or identical to this image i found?]

8 hours ago, ardneh said:

Adjustments > Posterize
Setting 4
 

Tested it, is not the same, it still has more than 4 colors, which this filter don't.

[Do anyone know a plugin with a effect similar or identical to this image i found?]