That is the exact page I was referring to. This was the part I mentioned: "From your installation disc, copy the TWAIN plug-in from the /<language>/Goodies/Optional plug-ins/Import-Export folder to the Applications/Adobe Photoshop CS4/Plug-ins/Import-Export folder on your hard drive.". I am using the Production Premium bundle, and not just PS CS4, solo. I tried to find such a directory on any of the 3 discs, but with no luck. That's where I was hoping to find some guidance.
Let's do this: download Photoshop CS4 from here: Download Adobe Creative Suite 4 (CS4) products
Open the dmg and see if there is a Goodies folder when you mount the disk image on your mac. You don't need to install.
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The optional Twain plugin is included in this Optional Plugins download for photoshop cs4.