Sometimes Windows Defender or third-party antivirus software (like Avast or AVG) deletes the file. Check your "Quarantine" folder and add an exception for the GTA V installation folder.
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Manually placing an outdated or modified .exe into your game folder often results in "Initialization Error" or "Social Club Error" because the launcher version does not match the game build. How to Safely Re-download gtavlauncher.exe gtavlauncher.exe download
This is often caused by a conflict with your dedicated GPU. Try disabling your integrated graphics in the Device Manager or updating your Nvidia/AMD drivers. gtavlauncher.exe download
