In June 2010 the Application Compatibility Toolkit version 5.6 was released. If you do a fresh install of the ACT 5.6 you need to use the following script to configure the ACT Connector to be able ti connect the updated database. The “wizard” in the console to connect to the database doesn’t work against the updated 5.6 database. It is however possible to configure it using the vbscript which can found in this blog post, it was initially for an older version of the ACT Connect but it works fine.
Act Connector 5.5 can be downloaded using the link below, the one included on the original SCCM Media is an older version.