Hello!
I don’t manage to make HDRP work like with Unity 2018.
Here’s a screenshot of my problems. As one can see, there’s no AA, and “Script missing” errors.
I have updated HDRP to “preview 5.10.0”.
What else could I do to make it work again?
Thank you.
@id0 But I can not select this in the package manager. It doesn’t offer that to me. I see your workaround, but why does it have to be this way? I’m asking because I have already followed your workaround and then stumbled over other problems, that’s why I wanted to find an “official way”.
2019.2 is still in alpha, I doubt it’s a big priority for Unity to provide everything out of the box for alpha releases.
“Official way” is to only use full releases and steer clear from alphas and betas 
You kinda automatically sign up for manual fixes if you use unreleased things.
I have changed the manifest.json file according to @id0 's description, but that “Script missing” on the camera didn’t go away. What else should I do, please?
I guess that missing script is “Post Process Layer”, but I don’t find that in my project.
Here is another “Missing Script” error:
HDRP has a new post-processing system that is integrated will all the volume components. So for that post-processing Volume gameobject just add a volume script to it and create a new profile and add all the effects you want or you can just add them to the Scene Setting’s volume.
You add to it with the Add Override button
Thank you. Can you tell me where I would find AntiAliasing as a post effect? I just don’t see it.
Anti Aliasing is now on the cameras and not in the Post Processing stack
SMAA doesn’t work if enabled on camera in v5.10. Screen goes to blue.
