Do not install to Program Files (x86) . Install directly to C:\Gamebryo\ . Folder permissions in modern Windows block the old exe compilers.
Gamebryo (formerly NetImmerse/Gamebryo LightSpeed) is a middleware game engine supporting C++ development, cross-platform deployment (Windows, consoles), and rapid iteration via modular subsystems. It’s known for use in titles like The Elder Scrolls IV: Oblivion and Fallout 3. gamebryo engine download full
: The engine uses flexible licensing tailored to project budgets, ranging from full-scale AAA commercial productions to smaller "casual" downloadable projects. Do not install to Program Files (x86)