disable antivirus and real-time protection, re-extract the files using WinRAR or 7-Zip, run the game as administrator, install or repair DirectX, Visual C++ and .NET from the Redist folder.
Run the game as administrator, disable antivirus/firewall, verify all files are extracted, and make sure no folders have non-English characters or spaces in their path.
make sure all Patch files (including GTAV.exe, steam_api64.dll) are in the game root, run the game as admin, disable antivirus/firewall, and ensure Visual C++ Redistributables and DirectX are installed.