Here is a cross post I put on Epson Wide Format: This works with Snow Leopard. Not sanctioned by Epson of course but it only takes 15 seconds or so.
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Simply right click on the latest 4800 installer and "Show Package Contents"
Do the same for the 7600 installer.
In the 4800 driver folder open Contents/InstallerData. Delete Installer.data
Then open Contents/Plugins and delete all of those.
From the 7600 package folder copy Contents/InstallerData to the corresponding 4800 folder.
Same goes for the Contents/Plugins items from the 7600 package folder.
This method works with every Epson os x print-driver installer I've experimented with so far. Enjoy.
All the best,
Walker
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Download link at:
http://uvm.edu/~wblackwe/sp7600snowl.zip