The (often misidentified as version 4.5 due to its dependency on .NET 4.5) is the final official release for running games built with XNA Game Studio. Despite the numbering confusion, the version required for modern Windows systems is actually the Microsoft XNA Framework Redistributable 4.0 Refresh . Why You Need the XNA Framework
Open . Look for “Microsoft XNA Framework Redistributable 4.0.” If present, you’re done. download microsoft xna framework redistributable 4.5