I have installed CS 6 Master Collection before using my Creative Cloud account, so I was not prepared for this strange behavior.
I am running
Model Name: Mac Pro
Model Identifier: MacPro4,1
Processor Name: Quad-Core Intel Xeon
Processor Speed: 2.26 GHz
Number of Processors: 2
Total Number of Cores: 8
L2 Cache (per Core): 256 KB
L3 Cache (per Processor): 8 MB
Memory: 24 GB
Processor Interconnect Speed: 5.86 GT/s
Software Mac OS X Lion 10.7.5 (11G63)
i have tried 4 times to install CS 6 Master Collection, and each time it halts at Preparing to Install.
What's the problem here?
uninstall any cs6 programs you have currently installed.
run the cleaner: http://www.adobe.com/support/contact/cscleanertool.html
then use adobe application manager to install your programs.