Windows upgrade to 1.14.4 fails

When upgrading to 1.14.4, I started to get following error message and not sure what to do (besides re-installing the whole thing).


And let me answer my own question. For some reasons, Tailscale service refused to die during the update (was spinning itself up all the time) so I guess that prevented the upgrade of the front-end. By manually stopping the service and then applying the new install package, the system started to work again.