Skyrim Special Edition v1.6 on Steam is required to play Skyrim Together Reborn. The Anniversary Upgrade paid mod pack is not required. In fact, we recommend that you play without it. The VR, console, Legendary, and Gamepass editions are incompatible. Skyrim Special Edition v1.5 is not supported either (aka pre Anniversary update). Verify the game files through Steam to ensure you have the most recent Special Edition update installed.