The whole process step-by-step
In this article we will try to give a detailed step-by-step guide of how to upgrade one Joomla! 1.5 site to a newer version.
SP Upgrade can be used for upgrading Joomla! version 1.5 sites. For upgrading from version 1.0 to 1.5, use this guide: https://forum.joomla.org/viewtopic.php?f=36&p=3331274#p3331274
Installing the package is the same as with any other Joomla! component. Go to your site's back-end Extensions, Manage and click on Browse. Locate the ZIP package and click on Upload and Install.
SP Upgrade is able to migrate (convert and transfer) the core data from Joomla! 1.5 (from now on called source) to Joomla! 1.6, 1.7, 2.5 or 3.x (from now on called destination) and above. You install SP Upgrade on the destination site, and you transfer items from the source database.
History Log assist you identify individual items, and whether they were transferred. It is also a necessary part of the copy process, so in case you face with any interruption (e.g. due to timeout, memory, network) it can keep track and when you rerun continue from where you had the timeout. It is very important not to delete the history log, until all items are Transferred and Finalized.
To access the options press button 'Options':
Core Joomla! Data Transfer View
If you the connection with the source database is not established then you will get below message:
Find here answers to the most common questions you might have about SP Upgrade and it's usage.