Hi,
I have installed and ran the A2 successfully on one of the macbook at home.  I was trying to install into another macbook running SL.  Each time when I click on the Logos4 icon to install, it will appear briefly at the dock and then it disappears.  
I cannot find the application icon in my application folder.  However, it creates a folder <logos4> in the user/library.  In the folder there is only one other folder <logging> with one file inside <nlog.config>.   I have copied the content of the file here:
<nlog xmlns="http://www.nlog-project.org/schemas/NLog.xsd" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" />
 
Can someone help me?