Forum Discussion
Microsoft Hyper-V Server 2019 is live on the Microsoft Evaluation Center!!
https://www.microsoft.com/en-us/evalcenter/evaluate-hyper-v-server-2019
Also live on Visual Studio Subscriptions on 6/19/19: https://my.visualstudio.com/Downloads?q=Microsoft%20Hyper-V%20Server%202...
Hermann1235 Hyper-V upgrade is not officially supported. Have you tried a clean install?
I haven't tried a clean install because it's my only one Hyper-V. So I cannot move VM and It's a lot of effort to reconfigure the server in a short time slot.
It seems the upgrade process is aware of in-place upgrade because and offer preserving existing data and also complain if VMs are running.
Also others mention that it finished successfully in prior versions.