x64 support
It works for x64 machines?
Should. Doesn't it?
See this
https://github.com/pkulchenko/ZeroBraneStudio/issues/500
Is it possible to upload sources for luasocket 2.x and instructions to compile it on 64 bits?
What do you mean? There is nothing peculiar about compiling LuaSocket for 64 bits on any platform.
What about tags for version 2.x? I don't know exactly what commit to use
Use the currently released versions. They work on 64 bit platforms just fine. If there are any specific current problems feel free to report them, but as far as I can tell there is nothing actionable in this issue.