After reinstalling the game again with a continued savegame I cannot find "infuse sorcery" spell anymore. I've definitely learned it the last time I played, but it's gone. As well I can't find it to buy with any common mearchant.

Did I miss anything? Mearchant Ovis or at least Bree in Act 3 should've sold it to my knowledge, but they do sell anything from this mod but this single spell.

I'm clueless right now, I can remember to have bought the book earlier before, but it seems totally gone, is there a way to use a command for re-spawn the books again?