If you are using a legitimate copy of the game but the tools still cannot find it automatically, your Windows Registry might be missing the necessary keys. This often happens after a Windows update or if you moved the game folder manually without uninstalling/reinstalling properly.
If you recently moved GTA V from one drive to another (e.g., from C: to D: ) without using the official launcher's "Move" feature, the registry still points to the old location. gta v installation path has not been automatically detected