Solution 31491: TI-Nspire™ or TI-SmartView™ Software Activation Returns an Error A18.
How do I resolve error A18 that occurs during activation of a TI-Nspire or TI-SmartView Software?
Please be advised this license type will be discontinued on November 7, 2023, and your current software will no longer be updated. Converting to a new, account-based license before that date is recommended. In most cases you can receive an equivalent subscription length free of charge by contacting TI-Cares.
For now, you may still activate and use your current software for the full license term, but you will not be able to reactivate or download this software again after November 7. If a new activation or download is needed after that date, you must contact TI-Cares to acquire a new account-based subscription.
Error A18 indicates that the license number being activated has already been activated on this computer.
No additional steps are needed to resolve this issue.
If you have any additional questions or concerns regarding this error, please contact TI-Cares Customer Support.