After installing a new Lazarus Version, a reinstall of packages is needed.
This tool located and executed in an directory above your Lazarus -package-directories can scan for those and generate a short batch file for calling lazbuild for all found Package lpk-Files. Usually the new packages appear in the palette without the need of a manual Lazarus - IDE - recompile.
Now there is a "exclude -from-scan list", when packages should not installed but sadly are located in the...