How I got this version?

[hasnogaems]

https://drive.google.com/drive/folders/1o3e7z3zJqqvj2mc5O1aOEM1CXSojY_cJ?usp=sharing
Is it from this repository? It used to be like that? Lua.exe instead of Lua5.1.exe ? Or in my case it was manually renamed and in this repo exe was always named Lua5.1?

[TFWol]

You could try uploading it to Virus Total and see if the name was known as something else.