Just looking at the screenshot in the initial post and correct me if I’m wrong but the screenshot looks to be a On-Premise HiveManager? Is it just the one AP or several?
If just the one, it might be a one off and I’d go for the manual upgrade like Chris & Sam have mentioned.
If more than one, I’d say there’s an underlying problem that may cause you to have issues with upgrading in the future, since you should be able to update between those two firmware versions. Have a feeling I saw similar before where the APs couldn’t resolve the DNS of the HiveManager anymore, therefore couldn’t get the download to work. Also as it’s on-prem (I think) give the HM a reboot just in case as some oddities can occur over time.