Nothing.
Check your Windows Security Quarantine and restore any files mistakenly flagged as threats.
If the game launches but crashes quickly or doesn't run smoothly, try lowering the graphics settings within the game. Sometimes, the default settings are too high for your system to handle.
Outdated graphics drivers are a common cause of game issues. Make sure your graphics card drivers are up to date. Visit the NVIDIA or AMD website, depending on your GPU, and download the latest drivers.
Jun minimized the installer and opened the folder. There it was: ForzaHorizon3.exe .