I have a client who needs to upgrade their Joomla 1.5 to the latest Joomla version. This is a fairly simple site without too many extensions. So there are a few things that will need to be done.
1. Upgrade Joomla framework
2. Convert the template to work with the latest version
3. Make the template mobile friendly
I prefer if all this was done on a test server so we can test and the live site will not be disturbed during this process