MAG is Gold, Beta for Everyone Soon – PlayStation.Blog

1. Log on to the PlayStation Store (tomorrow) and download the MAG Beta file like you would any other freely-available PSN video or
demo (298 MB)

2. Launch the MAG Beta program from your XMB to download a special patch that will restart MAG once the update has been received (another 38 MB)

3. After the reboot, the beta will reconnect and download the actual game data so that you can play (1.8 GB – 2.3 GB depending on your region)