Find dev_menu_bool 1/0 change to 1 in save edition.
It works you just need to make a save then as mentioned edit it in save editor from 0 to 1 then in game you will get a new interactive point called Dev Menu at the top right next to the chat bubble just press it to access the dev menu.
If you'd be so kind as to indulge us how exactly you made this work?
What save editor did you use?
Whatever I do (I load the save file into an online save editor that supports renpy; find the dev_menu_boolen, switch it to 1 for true, save the file...), as soon as I try to load that save in the game it says:
"This save was created on a different device. Maliciously constructed save files can harm your computer. Do you trust this save's creator and everyone who would have changed this file? - Yes / No"
I click Yes and nothing happens. I drops back to the save file selection.
I tried deleting persistent data with the option in menu, I renamed the "persistent" file in the save folder ...
Nothing helps.
I can not edit save files nor can I activate the Dev Menu.
I tried looking at the save file in Notepad++, I tried looking at it trough a Hex editor (HxD) - it's cryptic, can't find that line.
Anyone have an idea?
(Never mind, I solved it myself: see below update1 & 2)
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update1:
I found this mention:
You must be registered to see the links
And this workaround on the f95zone forums that seems rather complicated and you'd need to install python3 and ecdsa
https://f95zone.to/threads/new-renpy-save-check-coding.168169/#post-11411047
[In short:
it seems renpy introduced some security measures due to malware being introduced by online edited files.
They made the file system persistent by default for now.
For the time being, simple direct save edit cheats won't work as before and you need to take annoying additional steps to convert them.]
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update2:
It worked! Wow, and it was hell of a lot work too to circumvent the security measure for just this one save-file to merge it with your renpy security-keys so it would be accepted.
Now, when you copy the edited and additionally converted save file into your saves folder and load it in-game it will still give that "save was created on different device" warning, but if you hit "yes" now to accept the risk (and I think reconfirm that you are actually sure), this time it will indeed load that altered save and ... voilà! The Dev Menu shows in game ...
\o/