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I don't think it will install on 10.6.x. However, do you really want it installed, or is that just so the next installer will see it? If the latter, try installing the later version and see if you can enter the earlier serial number when prompted for the previous install. I believe you should be able to start wherever inthe chain you want, and if the installer won't accept the serial number for the previous version you can call a customer service number that should be in the dialog, I think, and they can provide a number that will work.
There is no need to install earlier versions. Anything earlier than CS3 is going to be a crap shoot.
Start with CS3 if you need it. If it was an upgrade you'll be prompted for the serial number of the earlier version. Then move on to CS4, CS5 and CS5.5 in the proper order.
Thank you both so much, this seems to be working for me. I appreciate the help!