I am using Apptrian Image Optimizer. The extension for Magento1. I have given all the necessary permission to the files which are responsible for optimizing. Still, I am getting the following error when turn on the error logs:-
DEBUG (7): optipng is not executable.
Please let me know if I have to install the utilities on the server as well. Or is there any way out to get this done, by not using the
P.S:- I have also checked the files and they are not corrupted