Hi!

Here is a detailed tutorial written by MaximusWudy

1. Download zip file from http://www.atarimania.com/rom_collection_archive_atari_2600_roms.html
2. Open Roms.rar > ROMS.rar and find Space Invaders (1980) XXXXXX
3. Extract all matches (there are 5 of them) into your destin folder
4. python -m retro.import . (don’t forget the point)
5. One of them worked! And continue with the amazing tutorial here: https://github.com/simoninithomas/Deep_reinforcement_learning_Course/blob/master/DQN/Space%20Invaders/DQN%20Atari%20Space%20Invaders.ipynb