I had RetroPie installed from source some months ago. It took a long time to compile but it worked and I wanted to update the emulators and such to the latest versions. I did something wrong because it didn’t work. So I downloaded the premade SD Card image that was posted here and it works great. However, I still want to know if it’s possible to update RetroPie (the emulators, RetroArch itself and EmulationStation, etc) and if so, how do I do it?
Because apparently the binaries from the SD Card image are from April.
Alternatively to what resentedpoet said, you could run the Setup Script and use the “source-based installation” to update individual components. Depending on the selected components this could take some time, though.
I’m assuming you are auto booting into emulation station. From ES, press F4 to exit. You should still have your RetroPie-Setup folder located in your home folder. Launch the file retropie_setup using the command
sudo ./retropie_setup.sh and follow petrockblog’s instructions.