running check50 gives the following error :

You have an old version of submit50. Please update your version of submit50, then re-run check50!

  • Currently all systems are operational
    – MARS
    Jul 29, 2019 at 20:17

1 Answer 1


According to the status page, check50 and submit50 are temporarily unavailable:

CS50 Status Page Message, 18:17 GMT, 29 July 2019

Status page URL: https://cs50.statuspage.io

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