The thing about Latin is, as likely anyone who has studied it knows, that there are more than one "Latin language" when it comes to grammar, style and even syntax.
In academia the Classical form is taught and Church Latin is perhaps touched upon in passing. This was at least the case for myself when I completed the study of Latin as my second foreign language, back in my university days.
BTW, for some reason the reconstructed Classical pronounciation is often NOT taught in academia, opting instead for much influence from Medieval Latin, e.g. not pronouncing "ae" and "oe" as written, but incorrectly replacing these with a long "e" sound. See for example
this YT channel for much information on the language (also on Ancient Greek - another tongue which should probably be learned by the serious occultist) and its various forms & historical stages.
Reading medieaval and later Latin grimoires requires familiarity with Church/Monk Latin and also the ability to read handwritten/printed Gothic Fraktur, along with the contraction marks and such orthographical conventions often used in such texts.
Hmm...perhaps the Picatrix would be a nice tome to start with? Fortunately the grimoires usually feature grammatically quite simple Latin.