From LifeType Wiki
Release notes for Lifetype 1.2.12
Lifetype 1.2.12 is a straightforward bug releases only update from 1.2.11. The bug fixes are pretty minor, although there are some more significant ones for those people running PHP 5.3 and higher.
These are the links to the full Lifetype 1.2.12 packages:
If upgrading from Lifetype 1.2.11, there are packages available which only include new or modified files and will allow you to upgrade from Lifetype 1.2.11 only. These packages can not be used to upgrade from 1.1.x or any other 1.2.x release:
NOTE: If you are still running php4, make sure to check out this bug report to avoid a menutabs error in the administration section.
Support for PHP 5.3+ added.
Various bug fixes, see the link below for the gory details.