OS10 for PowerSwitch S4128F-ON/S4128T-ON

Hello,

We have a PowerSwitch S4128F-ON/S4128T-ON with an older OS10 installation. We want to update OS10 on it but the warranty has expired for the switch. The "Dell SmartFabric OS10 Installation, Upgrade, and Downgrade Guide" at https://www.dell.com/support/manuals/en-ie/smartfabric-os10-emp-partner/ee-upgrade-downgrade/upgrading-os10-software?guid=guid-29a7887c-d5ed-4896-9cc6-9dcd614c0aee&lang=en-us states "A factory-loaded OS10 image includes a perpetual license". It came factory loaded to the best of my knowledge.

Where can we download OS10 from please?

Many thanks in advance.

Sean