Respondus Lockdown Browser not compatible with Window 10 S – Surface Pro

Windows 10S is not a compatible operating system with LockDown Browser, nor can LockDown Browser be obtained via the Windows App Store. At present, support for Windows 10 S Mode isn’t on the roadmap for LockDown Browser. Full Respondus Support Article

Compatible Operating Systems

Windows: 10, 8, 7. Windows 10S is not a compatible operating system.
Mac: macOS 10.12 to 10.15
iOS: 11.0+ (iPad only).