I dont know but it seems to me that the following files not included in Common_Library_2019.6.0

from release notes:

Added News Room - VirtualCam_Seq-Cam.xcomp to demonstrate using the sequencer based camera control board.

Added several Crawl_*.xcomp examples to demonstrate fetching text from text file, RSS feed, MySQL database.

Added several Data_Visualisation_*.xcomp examples

Did I miss something ?

Also It seems that the following xcomp added but didn't mentioned in 2019.6 release notes

Getting Started - 02 - 3D B - Built-in Geometries

Getting Started - 02 - 3D C - Shader Types

Also following error shown when opening Getting Started - 02 - 3D C - Shader Types.xcomp

>> Opening document Getting Started - 02 - 3D C - Shader Types.xcomp

Loading "[Test]:Images\Textures\gradient_v.psd$MIPMAPS=bicubic"

    Failed to load texture: File not found

Finally I think you need to fix 2019.6 release note page because it seems have missing or mistype words