Oh hey, v1.1 cool! I will probably check the content out later tomorrow. Though from my initial testing, the new save system is very... interesting. It reminds me of those Emulator save slots which is kind of odd for a game like this. I tested old saves and they seem to work, so the cheated save files should still work fine.
BUT OH MY JESUS LORD IN CHRIST! the save file's format is even more of a mess than ever before. I will re-adjust the instructions on page 11 later to accommodate the new changes. Keep a backup of your save before doing any flag editing.
Basically what the developer has done is when you save into the other slots, it creates another identical data block within the same file. So your "save.json" can go from a simple a hundred lines of code to hundreds of thousands with multiple save slot usage. This code block was barely readable in NP++ but now it is headache inducing to read, if you are using more than 2 slots. I highly recommend you use a program like Visual Studio Code to even read this giant wall of text.
If you are interested in editing the flags within the save file, the guide is on page 11! The cheated save file(money) is also on the same page.
Enjoy and Happy MILF Hunting!