harvesterHCI 1.0.3 is available, but it dont see a upgrade button in the right corner. is the upgrade not yet available via the dashboard?

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