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You can kind-of follow the start of the ‘air-gapped’ install from https://docs.harvesterhci.io/v1.5/upgrade/index#prepare-an-air-gapped-upgrade but just apply the version manifest instead of editing it https://releases.rancher.com/harvester/v1.5.0/version.yaml. That will give you the update button. Your Harvester cluster checks whether there are upgrades every now- and-then, something like every 2 weeks, so applying this speeds up that process 😉

Another option that I recently discovered and used with success was visiting Advanced --> Settings --> server-version. Choose "Upgrade" from the "..." menu. You can then point it at a Harvester 1.5.0 ISO image (I suspect that pre-release versions would also work) and it will kick off the upgrade.

Thank you @sticky-summer-13450, it did work.

# helm history harvester -n harvester-system
REVISION	UPDATED                 	STATUS    	CHART          	APP VERSION	DESCRIPTION     
7       	Sat May 10 14:25:34 2025	superseded	harvester-1.4.2	v1.4.2     	Upgrade complete
8       	Mon May 12 02:09:15 2025	deployed  	harvester-1.5.0	v1.5.0     	Upgrade complete

It's worth try by using your option on future upgrade task, @acoustic-addition-45641. Thank you.