Is Caliburn.Micro 4.0 still using a Bootstrapper?

Question

I'm trying to use Caliburn.Micro 4.0.102-alpha with .Net Core 3.0 But there is no BootstrapperBase.

So I have to ask: Is there now another concept or is the class missing in the alpha version?

• Is it too early to test Caliburn.Micro with .Net Core 3.0?
• Is there an other MVVM Framework available to use with .Net Core 3.0?

Your opinion or solution is very welcome :-)