Thanks for your answer. In fact, I understood and solved the problem, and just in case any one might also come also across it, i write down these lines. PS CC 2015 was installed as well as PS CC 2014. When I used install for the plug in, it looked for the first version and not the updated one. What I did was to drag and drop EasyPhotoPrint Pro from CC first version to the latter, and it just went on to work.