Most Classes?

[Selser]

PS. I know there is a thread similar to this but about original classes, and I didnt want to necro it.

Plus, the topic was more-so focused on the best class system, rather than most.

All I can say is Ragnarok Online, if you count Advancements.
1 Newbie class.
4 Alternate classes.
---+1 Alt has 2 advancements.
6 Base classes, each has 2*3² advancements = 35 Advancements (including advancing advancements) (Not including gender differences) (+4 with Gender differences) (Not including Rebirth extensions)

42 / 46 classes in total.

Without advancements, DOMO.
13 classes.