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 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.