Please note that starting from version 1.9.2 releases will be UNICODE only. The installer will come with binaries for all supported processor architectures (i386, AMD64, IA64).
Currently diff-ext installer includes binaries for 32bit and 64bit Windows OS.
Please let me know if you need non-UNICODE or single architecture version of the installer.
Older binaries and sources of diff-ext are available from project page at sourceforge