Settings > My installed games > GTA V > Verify Integrity .
If your installation is corrupted beyond repair or you are looking for a physical copy to avoid large downloads, you can find near you. Settings > My installed games > GTA V > Verify Integrity
Changing your DNS to a public provider like Google ( ) or Cloudflare ( Settings > My installed games > GTA V > Verify Integrity
If you are looking for missing files, it is to avoid third-party .rar downloads, which often contain malware or bloatware. Instead, use these official methods: Verify Integrity (Steam/Epic/Rockstar): Settings > My installed games > GTA V > Verify Integrity