At the end of config-local.pl, uncomment the TEXTCAPTCHA demo api key. (It should read "api_key => 'demo'"). The demo key only gives a small subset of the possible questions, but it might be sufficient to prevent the spam.
At the end of config.pl, in the section labelled "Pages where we want to see captcha", make sure that "support_submit_anon" is set to 1.
In Defaults.pm, make sure that $DEFAULT_CAPTCHA_TYPE is set to "T".
If you find that the demo textcaptchas don't stop the spam, it's only a little bit of hassle to sign up for free for a real API key.
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If you find that the demo textcaptchas don't stop the spam, it's only a little bit of hassle to sign up for free for a real API key.
HTH, and happy Christmas!