I'm asking a lot of questions, but I'm sorry. Thank you for kindly answering. Let's say I finished one game, I downloaded another game and started it. Do I have to delete the saves of the previous game before I start? Or is it okay if I don't?
As a rule, don't touch the saves in appdata.
It is a bit complex to explain to you all the intricacies, but, let's go with an example:
You Download and play a game, let's call it Game A, release 1.2.3
The saves are stored in 2 places, in the Game A, /game/saves and at appdata/Roaming/Renpy/GameA
When you finish that game, you decided to recover the space and delete the Game A folder, along that the saves that were stored there.
Later, Game A, releases version 1.2.4., you download it, install it and you start playing it, the game automatically loads the saves stored in the AppData. Along with the Persistent settings, this stores the changes you made to the Option/Preferences/settings page.
The same goes for all Renpy games. So, don't mess with the appdata, it will save you.
Peace