The save file paths differ depending on your Steam configuration. Check both of these locations:
Find a save file for specifically if you have the latest DLC. [Guide] How to install Dead God 100% Save File in Rep+ the binding of isaac repentance dead god save file link
Achieving Dead God status means you have every ending, every item, every bestiary entry, every challenge, and every secret tucked into Edmund McMillen’s twisted masterpiece. But let’s be honest: Not everyone has the time to beat The Lamb as Jacob & Esau on a hard mode streak of 5. The save file paths differ depending on your