Thank you for using Bitnami. Please note that Bitnami edX requires more than 6GB of RAM to work properly in the machine, could you please let us know the specifications of the machine in which you are trying to install the application?
Apart from that, in order to debug the issue better, could you please share with us the latest installer's log?
ls -alrt /tmp/bitrock_installer*.log
That's a temporary directory and the file may not exist if you restarted the server.