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what version of harvester are you currently running?

I'm not sure about the OP's version, but I'm on 1.0.2 and I also don't see an upgrade option (last time it was in the upper right, IIRC).

Yeah, we are working on this. I will let you know if it works. Thanks!

If your Harvester cluster doesn't show Upgrade button you can make it appear by running

$ ssh rancher@harvester-vip
rancher@harvester-vip:~> sudo -i
rancher@harvester-vip:~> kubectl create -f <https://releases.rancher.com/harvester/{version}/version.yaml|https://releases.rancher.com/harvester/{version}/version.yaml>

Replacing {version} with your current version+1 i.e. if running 1.0.2 then use v1.0.3 (include the leading v). That should allow upgrade using remote ISO. If you want to use locally hosted ISO see https://docs.harvesterhci.io/v1.0/upgrade/automatic/#prepare-an-air-gapped-upgrade