I am very certain at this point that you only got 1.17.
Is the error 'ScriptError: could not find label' ? Both labels are newly added in 1.18.
Another thing you can check is, do you have any files starting with k118 in the game/images folder?
(example: k118 1 copy.png) All images added in 1.18 start with it.
At this point I don't know what else I can do to convince you that you most likely don't have 1.18.
The party with Hannah and Vera is unavoidable. Only the ending can differ depending on drinking the spiked shot or not.
EDIT: if you do have the image files, but not the labels then perhaps you installed the 1.17 version of my MOD on top of 1.18. Then you need to re-install my MOD. Otherwise, re-download the whole game.