Joomla Upgrade Extension: Joomla Upgrade 1.5 to 1.7 (Everything you need to know). In this video i describe all the necessary step to follow in order to upgrade your Joomla 1.5 website to the new 1.7 version. I highlight the complexities of this process and how to go about handling them. this video is for advanced users or for users with at least a little bit of Joomla experience. Please subscribe and thrums up if you like what you see. leave any questions in the comments section.