Every time I hit "Play" Unity try to recompile scripts then appears message "Add Vuforia Engine Package". This thing is a little bit annoying. Current version of Vuforia is already added.
Unity version 2020.3.11f1
I Installed this version with "add-vuforia-package-9-8-8.unitypackage". This didn't work then I reinstalled Vuforia manually. After this "Add Vuforia Engine Package" message haunts me. If I hit "Update" Vuforia will be removed. If I hit "Cancel" message will be waiting when I hit "Play" next time. Adding another Vuforia versions not helped me.