There is a folder called Panther, that holds the logs called setupact.log, and setuperr.log. The setupact.log should contain a run through log of the installation progress of the latest build install. If it fails, it will normally roll back to the last build and the user will not know why it failed. This Panther folder may hold the only answers to why the install failed. The Setuperr.log should just display the last error in the install process, which may help diagnose exactly why the installation of the latest build failed. However, most likely you want to read the setupact.log.