I cannot download production software

My production software is currently being re-installed after I have done a clean install of Snow Leopard. After downloading the Max/MSP latest 4.6 version, I have tried to install the software and got a strange error message. I am very curious about a possible solution because I never got this strange error message before.
Can anybody help me, please?
Error:
The installation failed.
The following installation step failed: run postflight script for InterLok Extensions. Contact the software manufacturer for assistance.
