Even Sigil 6 has to be patched and built specifically for non-sse2 processors. So while it might be nice to note that you can get Sigil 0.6.x to run on those machines, you're going to have to patch the source and custom compile it to do so. Not so easy for the average Joe on Windows.
I think it's probably best to just accept that any version of Sigil after (and including) 0.3, requires an sse2-capable processor (if you want to point & click install).
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