1. Backup
2. Delete old folder "Assets/OSA" (You need this because importing unitypackages doesn't remove files that are not needed anymore)
3. Import new package
4. If you previously imported the Utils, Demos or any other sub-package, re-import it now.
5. Fix all compile errors. Most common issues:
    * `ItemPrefab` has been renamed. Example:
        - _Params.itemPrefab.gameObject.SetActive(false);
        + _Params.ItemPrefab.gameObject.SetActive(false);
    * `Grid` has been renamed. Example:
        - _Params.grid.cellPrefab.gameObject.SetActive(false);
        + _Params.Grid.cellPrefab.gameObject.SetActive(false);