Stride3d Source Code

I’m a little bit confused. What is the current stable version of Stride and where can I find the source code?
On Github I’ve found this Repo, but it has only releases till 3.0.0.6 and in the API documentation 4.0 is mentioned. Also the launcher seems to install a 4.x version of Stride Engine.
I assume the vsix releases on Github are only for the launcher, right?
Can someone please explain me the versioning and where I can find the latest stable version of the Stride3d and it’s source code?

That’s the correct repo. It is just that beta versions are not tagged.