Mac OS X 10.6: If you see a message offering to download and install software for a printer
You may see a message offering to download and install software for a printer while you’re setting up a printer or after you’ve connected a printer to your computer’s USB port.
If you click Install, your computer tries to download your printer’s software from Apple, install it, and then set up your printer. If you click Not Now, the software isn’t downloaded and the printer isn’t set up.
If you install printer software that you didn’t get from Apple, your printer’s software may not be updated automatically or when you use Software Update.