Upgrading Hyper-V to Windows Server 2025

I have one big Hyper-V server, currenting running Windows Server 2022 Datacenter, that I use for lots of things (with 12 cores, 272GB RAM, 8TB of disk space). Upgrading it to Windows Server 2025 should be a straight-forward process, right? Insert the media (mounted, downloaded ISO), run SETUP.EXE, do the upgrade. But it took a [ ]