You can download several 2015 builds Yandere Simulator through independent archive projects, as the official site typically only hosts the most recent version. These 2015 versions represent a major period of growth for the game, introducing foundational mechanics like smartphone camera Top Sources for 2015 Builds Internet Archive (YandereDev Old Build Archive)

Sometimes, developers keep older versions of their projects on GitHub.

• Look for the YandereSimulator.exe file.
• Compatibility Mode: If the game crashes instantly, right-click the .exe, go to Properties -> Compatibility, and check the box for "Run this program in compatibility mode for Windows 7."
• Screen Resolution: 2015 builds were designed for smaller monitors. You may need to change your screen resolution or play in Windowed mode (usually Alt + Enter) to see the UI correctly.

• These old builds are 32-bit and use deprecated Unity plugins. Modern antivirus software (Windows Defender, Norton) will likely flag them as "Trojan:Win32/Wacatac" or "Suspicious Behavior."
• 99% of the time, this is a false positive. The builds use DLL injection for the "Yandere Vision" mechanic, which looks like a keylogger to an AI antivirus.
• However, 1% of the time, it is a real virus.