If you apply a patched editor to a game that later receives an official update (new content, bug fixes), the patch will likely be overwritten. Worse, mixing patched scripts with new official data can cause hard crashes, corrupted saves, or infinite loading screens.
Ren’Py includes security measures to prevent players from loading saves or persistent data that might be corrupted or untrusted. You can "patch" the engine to disable these checks: renpy editor save patched
Sometimes a patch requires a player to have a variable they didn't have before. You can use a config.after_load_callbacks to patch saves automatically when they are loaded: If you apply a patched editor to a
"You may not modify, decompile, disassemble, reverse engineer, or create derivative works of the software." renpy editor save patched