This is a project for prestashop specialist. Upgrade the website and make sure that all prestashop features work properly, without bug, and without damaging current modules that are working well. Also the four translations must remain. The current version had some additional modules. Make sure the site is working properly on all browsers IE8, IE9, FF, Opera, Chrome, Safari.
Also the current installed theme must remain!
Upgrade has to be done trough installatron script installer, so future updates can be done from there.
I can update via installatron script installer to version 1.5,
Making everyhing work is for you.