I Can Not Find "2D Animation" after Update

I updated Unity to 2018.3.9f1

Before update, I can find “2D Animation” from Package Manager. I want to rig my sprites and animate them.

Then I updated but I can not find it anymore. I can download it from Asset Store but it did not solve my problem. I still can not find “Bone Editor” in Sprite Editor.

Thanks.

I found the solution. Just clicked on “Advanced” in Package Manager, and activate “Show preview packages”