To upgrade ZPhotoSlides from an older version to a newer version go to your
ZPhotoSlides object and apply the upgrade function. Example: http://www.yourwebsite.com/yourzphotoobj/upgrade

You can also do a recursive upgrade on a ZPhotoSlidesFolder so that it upgrade all the ZPhotoSlides inside it by using the upgrade_zphotoslides function. Example: http://www.yourwebiste.com/yourzphotoslfolderobj/upgrade_zphotoslides 
