Older R2 builds based on legacy Windows platforms. For archival and compatibility purposes.
R2 build based on Windows 10. Optimized for stability and performance on 64-bit systems.
R2 build based on Windows 8.1 for 32-bit systems. Suitable for older or low-resource hardware.
R2 build based on Windows 8.1 for 64-bit systems. Better performance on modern hardware.