Install and Upgrade Symfony CMS System from 1.2.4 to Newer Version

I am using a website with Symfony 1.2.4 which is around 4 years out of date. I am attempting to transfer my symfony installtion to a new server, however this requires installing this symfony cms as a brand new system, and then connecting to the database. Our problem is, that because our version is so out of date, the database fields may not match the new install of the cms. We have a website using the older Symfony cms system. However we want to transfer it over to a new server. This requires you to 1. Install a newer version of syfony and 2. reinstate our current website to the newer version of symfony.