Well that's weird... I gave the 64 bit version to someone else before and it seemed to work fine. I'm not familiar with Debian though (I use Arch btw), so I can't help you out there. My suggestion would just be to run the HTML5 version of HTRAGS1 since that version runs mostly well. But the HTML5 version of HTRAGS 2 isn't amazing with a lot of stuttering...
Anyways, sorry for the long ramble, here's the 64bit version of HTRAGS 2.