I'm not sure where to find the source code. The Mac version needs to be recompiled for Apple Silicon before it is too late. They will probably drop x64 emulation support in a few years.
I haven't looked much into what is in the actual link (and haven't looked at it since I made this forum topic either) but if I'm interpreting what it says correctly then the source code at least for Windows might be in this link. Idk how much use it would be for Mac and Linux versions but may still be worth a look anyways. If it is the full source code as the page claims it to be we might be on to a winner here.