The SpineOMatic label printing software is available as a Cloud App or a Windows PC App. The Cloud App is available to be installed from the Cloud App Center which is available within the Alma interface and is the suggested method for printing call number labels per Ex Libris. There is some functionality however that seems to be only available in the PC App, mainly configuring prefixes to display above the call number.
The PC App can be downloaded from GitHub website here: https://github.com/ExLibrisGroup/SpineOMatic (Look towards bottom of page for “Installation Instructions and spinelabeler.exe”) The PC App requires obtaining an API key from FLVC (send request to firstname.lastname@example.org).
Please see this Libguide article for additional instructions: Using SpineOMatic Software with Alma