I also recently figured out how to run 32 bit programs on my 64 bit linux. I forgot all the commands I did since I did it over time, but I basically added the 32 bit architecture, then got the ia32libs package or something like that, and a few other libraries tpt uses like bz2 and fftw3f I had to install the :i386 package.
And the reason there is no 64 bit one is because the server tpt is compiled on is 32 bit.