The feeling is that "no", but here asking regardless:
Will a 64bit application program be installable and runnable on a 32bit computer and operating system(Windows)?
I found a link to a 64bit program to download and install, and on the webpage, system requirements say compatable with 64bit and 32bit Windows o.s. including Vista. When looking at the next page with the download button, only it said "64-bit".