I guarantee you it's not 64 bit. I've also downloaded the Windows and the Linux version, unpacked them, and ran the file command on the invoker binaries. Here is the result: https://pastebin.com/KFY1bf61.
It's clearly built using the 32 bit setting (i386). And you can see that Unity itself was also linked as 32 bit version. Could it be that you developed the game on a 32 bit Windows system?