All of their materials seem to be available on their file share website here: https://edu.postgrespro.com https://edu.postgrespro.com There's some stuff for i

All of their materials seem to be available on their file share website here: https://edu.postgrespro.com https://edu.postgrespro.com There's some stuff for internals (mentioned in a sibling comment), as well as what seems like stuff for PG15 though I haven't looked at it.