When upgrading Gigastor and observer to a new major version, i.e. 15->16 or 16->17 You must first acquire a new license.
Each major version requires a version specific license.
If you upgrade before obtaining these licenses Gigastor and observer will throw the following error:
To obtain a new license contact support with the following information:
Maintenance & Warranty Number:
For GigaStor 17 downloads please see the following post: