The most common fix for this is:

1. Log into your online account
2. In the Syntorial section, click "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:
  
• V1 has a light theme:
  

It you're using the correct version, reach out to us via the Contact Us at the top of this page, 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