Here are potential reasons and fixes
Antivirus software blocking the executive file to launch. Look in to security app's settings to exclude scan or make an exception (whitelist) Flashing Lights directory or exe file.
To find the directory:
- Go to your Steam Library
- Right click on "Flashing Lights"
- Select "Properties"
- Head to "Local Files"
- Select "Browse"
After excluding it, might need to verify game files:
- Go to Steam Library
- Right click on "Flashing Lights"
- Select "Properties"
- Head to "Local Files"
- Select "Verify integrity of game files..."
DeepGuard/F-Secure/other security app is blocking the game. Try to turn it off or make an exception then test the game again.
Corrupted Steam installation. Reinstall Steam client.
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