Folders to optimize

I think you should check out some of the videos here: https://www.ads-software.com/plugins/ewww-image-optimizer/installation/

1. that probably is not necessary, see the videos for more information
2. if you do find it to be necessary, the folders to optimize IS recursive, so it includes sub-folders

You are right nosilver4u, it doesnt look to be necessary.

I will give a try and install pngout later manually, because even thought the permissions are right it doesnt install.