Tried updating but kept coming up with error as signature is invalid...? can anyone help? I'm not very computer savvy so lamens terms would help.. thanks

Tried updating but kept coming up with error as signature is invalid..?? Can anyone help.? I'm not computer savvy so please respond in lamens terms..
Thanks

It is hardly Apple's fault that Epson can't/won't update their driver, but at least Epson suggest that you use the Gutenprint driver, which in any case is far better that what Epson offer.
You can get it here:
http://gimp-print.sourceforge.net/
You can download the latest version from here:
http://sourceforge.net/projects/gimp-print/
Have you downloaded the recent Apple update to Epson drivers?
http://support.apple.com/kb/DL1398

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