Go to Settings > Assetto Corsa > Apps and check all "Sol" related boxes (e.g., Sol Planer, Sol Config).
Sol requires CSP to function. Version 0.7r5 is very old, but modern CSP versions (1.76 or newer) are generally recommended for stability.
After installation, you must activate the mod in Content Manager settings: SOL_0.7r5_Win64_.zip
In Settings > Assetto Corsa > Video , set your Filter to a Sol-compatible one (like "Sol" or "Sol__Extra") for the best visuals.
If you experience bugs, consider upgrading to the latest version of Sol (currently 2.2.9) available on platforms like Overtake.gg (formerly RaceDepartment). Go to Settings > Assetto Corsa > Apps
Use a tool like 7-Zip to open SOL_0.7r5_Win64_.zip .
Drag the SOL_0.7r5_Win64_.zip file directly into the CM window. After installation, you must activate the mod in
Manual installation is often more reliable for Sol to ensure all system files land in the correct folders.