The most common fix for this is:
  1. Log into your online account
  2. Go to "Authorizations"
  3. De-Authorize all CPUs and iPads
  4. Try authorizing Syntorial again

If that doesn't work, make sure you're authorizing the correct version. Version 1 and Version 2 each require different serial codes. The easiest way to know what version you're using is by Syntorial's visual appearance:
  • V2 has a dark theme:
    Image Placeholder
    • V1 has a light theme:
      Image Placeholder


      It you're using the correct version, use the Submit a Request link at the top of this page to contact us, and include the following:
      • Mac/Windows:
        • Open Finder
        • Go into the Documents/Syntorial folder
        • Grab the "log.txt" file
      • iPad
        • Open the Files app
        • Select "On My iPad" on the left side of the screen
        • Go into the "Syntorial" or "Syntorial 2" folder (depending on which version you're using)
        • Go into the "Syntorial" folder
        • Grab the "log" file there