The version of SQL Server 2008 is so old that it is not supported. You can upgrade it to the latest version SQL Server 2022. you can't do this directly, you need to upgrade to an intermediate version. You can refer to this document:
You also need to consider whether the operating system is compatible. If it is not compatible, you will also need to upgrade your operating system.
Alternatively, you can try restoring the backup file of the SQL Server 2008 database to an instance of SQL Server 2022 in your test environment.
For detailed information about the license issue, you can call 1-800-426-9400, Monday through Friday, 6:00 A.M. to 6:00 P.M. (Pacific Time) to speak directly to a Microsoft licensing specialist. Or you can go to Volume Licensing Service Center support. Please choose region/language and choose to call or have web.
Best regards,
Seeya
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