FracLac for imagej

[Biz7662]

Hi all,
I was trying to install the plugin "FracLac" but it doesn't appears on my program.
Does anyone know why ? It's possible to solve this problem ?

Moreover I tried to download the file FracLac.jar and put it on the directory of ImageJ.. but actually I don't understand where could be this directory on my MacBook :/

Any ideas ?

Thank u

Anthony