How to Mod SiNiSistar 2 Safely (Patch Compatibility & Rollback)
Quick Summary
"Install the R18 patch first, then mods. Back up the game folder before replacing any file, never mod while the game is running, and match every mod to your game version (v1.3.1)."
Modding SiNiSistar 2 is straightforward if you follow one rule: never modify files without a backup. Step 1, note your game version on the main menu - mods built for an older build can break combat or corrupt saves. Step 2, install the official R18 patch before any third-party mod, since most mods assume the uncensored asset set. Step 3, copy your save data to a safe location (see our save location guide). Step 4, close the game completely, then place mod files into the folders the mod author specifies - usually replacing assets inside the installation folder. Step 5, launch and test in the gallery before playing seriously. To roll back, delete the replaced files and verify integrity from Steam, or reinstall and restore your backup and saves. If the game crashes after a mod, remove the most recent mod first before trying anything else.