I'm reading through the 20th Anniversary book, and I'm not quite sure how leveling up Thaumaturgy works. On page 212 it says this:
When a character first learns Thaumaturgy, the player selects a path for the character. That path is considered the character’s primary path, and she automatically receives one dot in it, as well as one Level One ritual. Thereafter, whenever the character increases her level in Thaumaturgy, her rating in the primary path increases by one as well. [...] Path ratings never exceed 5, though the overall Thaumaturgy score may. If a character reaches a rating of 5 in her primary path and increases her Thaumaturgy score afterward, she may allocate her “free” path dot to a different path. (Experience costs are covered on p. 124.)
I'm not entirely sure what leveling Thaumaturgy past level 5 is going to cost at this point. The XP cost on leveling Thaumaturgy costs (current rating) X 4. This means that the fist level past Thaumaturgy 5 would cost 20, the next 24 and so on. However, this creates the suggestion that a vampire cannot have more than 9 points spread all across Thaumaturgy, which I feel clashes with the statements that Thaumaturgy is very mutable and flexible made throughout the book.
The other alternative would be that once you hit Thaumaturgy 5 you can start buying from different paths, but by the strictest reading of the XP rules this would mean that the first dot in a path is free (0x4=0), which I feel cannot be the right way to go about leveling up. So how does this work?