@Eugene Pieterse 

You have previously used the trial license on your machine. Unless you reinstall Windows or clean registry settings, you won't be able to use the same trial license again. Consider purchasing a one-time license for QBD 2020 UK or QBD 2021 CA to upgrade your client data file and migrate it to QBO UK or CA.

However, if your client prefers to use QBO South Africa version, consider purchasing a third-party conversion service. Contact us in private for details.