There is no official digital release. However, fan-created communities have begun digitizing the audio cassettes (with varying degrees of hiss removal). A quick search on private language-learning trackers or French nostalgia forums may yield MP3 rips, though their legality is dubious.
L'École de Laetitia 22: Le retour de la directrice . L--ecole de Laetitia -vol. 1 Et 2 -1994-
If you’d like, I can: