It depends on which application you're using. For BBEdit, you would copy the scripts into the Scripts folder inside the BBEdit folder inside Application Support. This page:
Mike: If you're getting 99.5% with Spamfire out of the box, great. I don't think everyone sees that level of accuracy. The point about learning stands. Spamfire learns about new kinds of spam through paid "filter updates"; SpamSieve doesn't need those.
[Version 1.3.1]
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Arq
Michael Tsai rated on 20 Sep 2011
[Version 2.2.1]
BBAutoComplete X
http://c-command.com/bbautocomplete/manual-ah/integration-scripts
tells exactly which folders to use.
SpamSieve