Didn’t work out of the box

Installed this plugin (a paid version by a third party of two free popular plugins!) and I had high hopes with it that it combined two functionalities into one. But, having installed it I saw no effect on existing wordpress galleries or those that I aded just to check the functionalities of this plugin after installing it. I’m using the latest wordpress and this plugin doesn’t seem to work with it. Nothing happens with wordpress default gallery. No justified images and no lightbox of any kind! Complete waste of time and efforts.