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07/29/2013 at 20:21
#2569
Keymaster
To use the RetroPi GPIO Adapter you just need to enable SNESDev via the RetroPie Setup Script that also comes with the SD-card image.
With respect to updating an existing installation have a look at https://github.com/retropie/RetroPie-Setup/wiki/How-to-Update-an-Existing-RetroPie-Installation.