Always check the "Limit installer to 2 GB of RAM" box during the initial setup screen, especially if your PC has 8 GB of RAM or less. This significantly increases installation stability.
To ensure a successful installation of the FitGirl Repack and avoid common errors like "ISDone.dll" or stuck progress, follow these best practices: Bus Simulator 18 PC Game (FitGirl Repack)
Temporarily disable Real-time protection in Windows Security before starting the setup to prevent files from being quarantined. After installation, add the game folder to your exclusion list before turning protection back on. Always check the "Limit installer to 2 GB