It sounds like you’re referring to a of Windows 8.1 Pro, specifically build 9374 (which was a leaked pre-release / beta build from early 2013).

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Windows 8.1 Pro 6.3 Build 9374 X86 Lite Free 📥

It sounds like you’re referring to a of Windows 8.1 Pro, specifically build 9374 (which was a leaked pre-release / beta build from early 2013).