We need help for update our current prestashop theme (based on 1.4) to prestashop 1.5. "it is highly advisable not to adapt 1.4 theme to PrestaShop 1.5, but rather start with the default theme and adapt your HTML and CSS files to it. This way, you will ensure that all the new features from PrestaShop 1.5 will be included in your theme out of the box." So this is the path we want to take in updating to prestashop 1.5. We would also like to maintain our current one page checkout process. Our site is [url removed, login to view] . There lots more future potential work after updating. We would like to add many other integration features as well. Also please assess and let us know if upgrading to new prestashop theme would be faster and less expensive. We are trying to determine if updating with existing theme is better and working with brand new theme is more viable option.