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Sibelius 5: 'Your serial number appears to be corrupted'
'Your serial number appears to be corrupted' appears when entering serial number in Sibelius 5 on Mac OS X 10.7 Lion

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Last Updated : April 18, 2018
Products Affected : Sibelius

How to allow your Sibelius serial number to be accepted in Sibelius 5 on Mac OS 10 Lion?

NOTE: Sibelius 5 is not supported on Mac OS 10.8 or later so you will need to upgrade Sibelius.


When attempting to enter your serial number into Sibelius 5 on a computer running Mac OS 10.7 Lion, you may receive the following error message:

"Your serial number appears to be corrupted. Please contact technical help quoting the following number: "

This error occurs because permissions issues are preventing Sibelius 5 writing the serial number information to disk properly.


  • Click OK to close the error message.
  • Bring the Finder application into focus by clicking its icon in the Dock.
  • In the menu at the top of the screen, click Go > Go to Folder.
  • Type /Library/Application Support and click Go.
  • Inside the Application Support folder, create a new folder by either right-clicking in the folder and choosing Create new folder or by going to the File menu and choosing New Folder
  • Name the new folder Sibelius Software (being careful to include the capital letters).
  • If this folder exists already, delete it and re-create it manually.
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Next, set the permissions on the Vionic Riley Grey Sneaker 11 W Women's Casual Sibelius Software folder that you have just created as follows:

  • Select the Sibelius Software folder and click File > Get Info.
  • From the Get Info dialog, click on the arrow next to Sharing & Permissions to expand it.
  • Click the padlock symbol in the bottom right and enter your administrator password.
  • Make sure that the user labeled (Me) has the Read & Write privilege selected.
  • Click on the cog symbol, and choose Apply to enclosed items.... Click OK when prompted
  • Close the Get Info window.

This should leave you with a folder /Library/Application Support/Sibelius Software that Sibelius 5 can successfully write to, allowing you to now run Sibelius 5, enter your serial number again and go on to register.

NB: Automatic registration over the internet of Sibelius 5 or 6 will not work on Mac OS 10.7 Lion, so you should choose the second option to Register using a web browser..., as explained here.

If you are still encountering problems, please contact Product Registration Support.

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