Sophos XG Firewall v18 EAP 3 Refresh-1 - Update failed

I have the KVM version of sothis XG v18 EAP3.

I get the notification update (VIKM-18.0.0_EAP3-Refresh1.KVM-285) from the Sophos XG interface, I click on download, install... and then I get this error

New firmware could not be uploaded. Please refer to online help for possible reasons

And this is why I get in the logs

Firware Installation failed because of Appliance version mismatch
 
How can be a mismatch If I am downloading it from the Sophos interface?