I ask because it's being discontinued very soon and I'd like to make sure I've downloaded all versions. (I only have 32-bit Windows installed at the moment and the website might serve a different binary depending on your operating system)
No, they did not create a 64 bit version. Later versions were compatible with 64 bit systems. There was no need or benefit in creating a 64 bit version, as its internal database was small and quick.
Do you really want a desktop search application gobbling up 4GB or more of memory if it was available to it?