I have a customer Joomla 1.5 site, which needs to be upgraded to the latest version 3.4.
The 3.4 site will be set up on a new development server we provide which will become the live site. The site is pretty simple with really just one component (Akeeba Backup). The original 1.5 site (still live) uses a Rockettheme template. The same template is available in 3.4 which will be used for the new site which has already been installed.
Before the server switch is made, the new development site must match the original site, at which time the switch can be made.
eg. the upgrade procedure would be broadly similar to this:
We'd like other plugins that are currently on the site to be upgraded so that everything works correctly with the latest version. Any compatibility problems with plugins should be identified and worked through.