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Same, in Unity 2019.4.16f1 with a fresh install with no warnings or errors.
FWIW I see this warning a lot also and my project does not spawn any jobs at all. I mean, maybe indirectly as a consequence of using some Unity...
FWIW I am having a similar issue: I have a character with an Animator, a track in the timeline associated with that Animator, and a clip that...
I hit the same issue. When the installer runs, I had to choose (manually) C:\Program Files\Unity as the destination folder. Then installation...