How to use Havok Physics?

Please help me.I'm Unity 2019.3 Personal,I imported the Havok Physics package and selected Havok Physics in Physics Step.When I Run,It reminded me:No Havok Physics subscription found for current user.
What should I do?

 

Make sure:
1) You are using the latest version of the Havok Physics package
2) You are signed into the Unity Editor

 

Yes,I have signed into the Unity Editor and using the latest version of the Havok Physics package(preview-0.12)

 

Did you ever have a Pro subscription or do you have an Educational license? We still need to work out how to enable the latter.

 

I used Unity Personal,isn't it free to use?

 

OK,I reactivated the license once, and now I can use Havok Physics, but why is it not as good as Unity Physics?

 

I am glad that you have managed to run Havok.Physics.

Could you provide more details around what is not as good as in Unity.Physics?