Step 1 : Download all the needed files
You'll need couple of things…
- computer with Mac system installed
- SD Card reader/writer
- a program called RPi-sd card builder: Download here
- SD Card Image packed in Zip format, please chose one you need:
- Raspberry Pi 3 Model B - Retropie: Download here
- Run the app.
- Select the unzipped SD Card Image (.img file).
- You will prompt whit this. After you connect your sd card press continue.
- Now you have to select your SD card. BE CAREFUL, see the name and select ONLY one SD card.
- Now the program will need administrator privileges. insert your password.
- Confirm that your sd card has been unmounted. When you confirm that, press continue. (this can take a while).
- And that's it..now you can connect your sd card to your raspberry pi…
Then you can try it out in your Raspberry Pi. If all went well, your Pi should boot up (start). It may take about one minutes. If nothing's happened after that, look at the LEDs on the Raspberry Pi. If you only get the red power LED, either the card is not inserted properly or it can't boot this combination of card and image, or something went wrong with the process. But in the main it should work well.