Upgrading Bonfire

0.7.4 to 0.8.0

1. Update /application/config/constants.php (update BONFIRE_VERSION).
2. Update all files in /bonfire/ci3/
3. Update /public/index.php (change $system_path to point to CI3).

Using CI2

If you are upgrading an existing site and wish to continue using CI2, simply leave your /public/index.php file alone, or rename your /bonfire/codeigniter/ directory to /bonfire/ci2/ and update your $system_path in /public/index.php accordingly.
Check the CodeIgniter 2.x Support in Bonfire documentation for additional details, if necessary.