Unable to use Niagara plugin

The editor won’t open after enabling the Niagara VFX plugin
Stayed at 45% state when starting again

The task manager shows that the memory and cpu of the ue4 editor remain unchanged.
Or a state that is not running

How long did you let it run for? I have had some really long waits when I turned it on in a big project. You could also try making a visual studio solution for your project and opening it that way, at least then you should be able to read the output to see what exactly it is stuck on.

Thank you, running for two hours is like this, and it is a new project with no assets inside.
I try to try it out according to your method.
thank you very much