Thanks again for the reply. At current, this is the script exactly as it exists:
1. executeShellCommand("cd /Users/username/Downloads/", "Execute as System", "Max OS X", "Halt on Fail")
2. executeShellCommand("sudo installer -pkg 'Sophos Anti-Virus.pkg' -target /", "Execute as System", "Max OS X", "Halt on Fail")
I used the 'New Procedure' icon to create this. Apparently some things needs to be added later manually.
Thanks for the assistance! I'll try editing the script and see how it works.