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You can still use 6.4 forwarder for Windows 7 and it will send fine to the newer indexer. I'm willing to bet that the newest version will also work with 7 it is just not supported.
I have had some customers successfully install 6.5.x on Win7, but it has a check to say that it's unsupported. Not sure why it didn't stop them from installing it in the first place...
But yes, it might install, but it is fully unsupported.