Xsd and Xml Validator
If you are currently facing this, users and official support suggest these steps to clear the error:
: If you are on the go (like with a Steam Deck), briefly connect to a mobile hotspot, launch the game until you reach the main menu, then close it and return to offline mode. Advanced Troubleshooting gta v offline activation data could not be loaded
Latest version 1.0 SimpleXmlValidator.zip 835K - Portable version, extract to any directory and start via SimpleXmlValidator.exe
Note: requires Microsoft Visual C++ redistributables, usually already installed. If you get startup error, install from this link