: Run setup.exe from the mounted drive to install the game.

: Right-click part1.rar and select "Extract Here" using a tool like WinRAR or 7-Zip . It will automatically pull data from all other parts to recreate the full ISO file.

: Once extracted, you will likely see a .iso file. On Windows 10/11, you can double-click it to mount it as a virtual drive.

To properly use this file, follow these standard steps for multi-part archives:

: After installation, look for a folder named CODEX inside the mounted ISO. Copy all files from that folder and paste them into the game's main installation directory, replacing the existing files. Gameplay Resources

: For troubleshooting or finding save file locations, check the PCGamingWiki page . Mysteria~Occult Shadows - Steam Community

: You must have all parts (e.g., part1.rar , part2.rar , etc.) in the same folder. If any parts are missing, the extraction will fail.

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