I don't know if it is fixed in the patron update but Maid_harem in script.rpy on line 5276 is undefined. I can't find a dedicated feedback or bug report place but I might be blind.
Anyways uh actual review: 10/10 game it does what is advertised and more. A wide variety of transformations, a few sex scenes 3 of which have images to along with them, A LOT OF DIALOG that really helps flesh out the characters, a variety of wonderful stories and endings. The completionist's flame in me has been loving this game.
Three notes:
1st. despite the intent to add a disclaimer that the web version isn't up to date there is no clear indicator but is pretty to tell - "The guy who didn't notice for over a month at least of playing the game every now and then" anyways highly if you see this comment don't waste your time download the game for new artwork, so you aren't hunting for small talk later, and overall more content
2nd. if you're trying to download this for Linux try this: download and enter the pc.zip file (of course its marked as Linux) and then THE MOST IMPORTANT PART right click the folder and right click the RoyaleHarem-0.34.1-pc, click terminal type ls copy the that ends with .sh and enter. Do not be me who spent 30+ searching through Google and slowly learning Linux ( note this is user error but I hope it'll help you)
3rd. if you're using the walkthrough as another person said a few of the transformations aren't listed at bottom but they should be somewhere on the pdf at least from my experience
anyways have fun