Error code S28 indicates that the license number has no activations remaining. If you need to move a license from one machine to another, please contact us for assistance using our contact form here
Before you contact us, please have ready:
Your 31-character license number (Single Licenses) or your 20 character claim number (Volume, Concurrent, or School-Managed Licenses) accessible. This license number can be found on:
• Your software's CD Sleeve / With the handheld packaging
• Your software's confirmation e-mail
• The "About" dialog in TI-Nspire Family software version 3.0 and above.