This is a 32-bit application because the setup build date is from 2004. In 2004 64-bit architectures were barely on the market and developers choose to release their apps on 32-bit since it was widespread across the world on PCs.
I've tried to obtain an update to this application, but the official website appears to be discontinued, meaning that the domain doesn't point to a valid hosting storage, therefore no website.
As a personal note, I've installed it on Windows 10 x64 and it's working just fine.