There is, as far as I know, no Windows installer that will install a 32-bit version of Wireshark on a 32-bit system and a 64-bit version of Wireshark on a 64-bit system. However, as Chris Maynard notes, the 32-bit installer will install a 32-bit version of Wireshark on a 32-bit or 64-bit system, and the 32-bit version will work on a 64-bit system, albeit with a smaller address space, so it won't be able to read as large files as the 64-bit version can.
If you're not talking about Windows:
answered 22 Sep '11, 22:52
Guy Harris ♦♦