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I’ve just got the same issue updating from 23.0.5 to 24.0.1 and this hack helped to finish the update. Thanks! It’s a shame that NC devs couldn’t fix this bug for 3 years.

This worked for me. Worth noting that I did NOT have a /data/updater-xxxxx/ directory.

It is as amarus describes. And the issue is, that you need to

  • add the line after avery update in -htaccess
  • and also delete the old update folder in data.