Page Composer 2.4.x Compatibility
The Page Composer is compatible with Sakai 2.5.0 out of the box, but needs a small set of patches to work with 2.4.x, as well as a minor database conversion.
The JIRA issues that are related to this are:
David Haines has created some patch files for use with the CTools 2.4.x instance. Note that these should work fine, but are not guaranteed to work with other installations.
The simple database conversion SQL statements are included in /reference/trunk/docs/conversion/sakai_2_4_0-2_5_0_oracle_conversion.sql and /reference/trunk/docs/conversion/sakai_2_4_0-2_5_0_mysql_conversion.sql for Oracle and MySQL, respectively. They are reproduced here for convenience.