Script Fu Layer Effects

[rich2005]

best guess (caveat, I do not use OSX )

1. It is a plug-in, needs to go in your plug-ins folder, probably

/Users/{your_id}/Library/GIMP/2.8/plug-ins
or possibly
/Users/{your_id}/Library/Application Support/GIMP/2.8/plug-ins
depending on the version of Gimp

2. It is a plug-in, needs to be made executable usually command line something like

Code:

sudo chmod +x 'path-to'/plug-ins/layerfx.2.8.py

although there are utilities that can assist maybe
http://www.lagentesoft.com/batchmod/