Thanks for this. Link below. Since I didn't save the first time, this time I found a "spell for Cait" (avoiding spoilers), but as soon as I selected it in the garage, exception again, with webp issues regarding Cait. But this time I saved before clicking the potion.
Hopefully you can access this save:
https://mega.nz/file/ZIJQXAjY#WgVs7TxptyV8C9qenIeJyNyk4ecQi7Wgrq3G6K8wGzM