Hey Bill,
Look in the "amd64" folder. That's the x64 version of TurboActivate for Linux.
Historical aside: the architecture is called "amd64" because it's an extension of Intel's x86 architecture developed by AMD. Intel then adopted AMD's changes for their "x64" processors.
Short answer: amd64, x64, 64-bit, all mean the same thing. Namely, it runs on an Intel-compatible x64 chip.