Sometimes, developers keep older versions of their projects on GitHub.
Overall Rating: ⭐⭐⭐☆☆ (3/5 – for archival/historical interest)
As someone who followed the development of Yandere Simulator from nearly the beginning, going back to the 2015 builds is like opening a time capsule. These versions are raw, buggy, and incredibly barebones compared to the modern debug builds, but they offer a fascinating look at what the game started as. yandere simulator old builds 2015 download
The fan-run wiki maintains a "Version History" page with direct (or archived) links to every major build since 2014.
Is downloading a 2015 build legal? Generally, yes. YandereDev released these builds publicly for free. As long as you are not re-hosting them on a monetized site or claiming them as your own, downloading an archived copy for personal use falls under fair use and abandonware principles. Sometimes, developers keep older versions of their projects
However, note that YandereDev has expressed mild displeasure at fans playing old builds because they "misrepresent the current quality of the game." From a user perspective, as long as you understand the 2015 build is a historical curiosity, not a representation of the final game, you are ethically fine.
Before you download any old build, you must understand a critical technical issue. Is it a virus
Old builds of Yandere Simulator are notorious for triggering Antivirus software.
In 2015, the game was still in very early development. The code was unoptimized and used certain packaging methods (and sometimes third-party assets) that modern Antivirus software like Windows Defender, Avast, or Norton often flag as:
Is it a virus? The general consensus among the community for years has been that these are False Positives. However, because these files are old and hosted on third-party archives, there is always a risk.