I've set that guest must solve a captcha to download files, but there are no captchas shown.
Captcha should work, because it is also shown when guests register.
Using latest jdwonloads, jomsocial and recaptcha.
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I can not really confirm this bug with default configuration settings. See pic.
Have you it tested locally?
Edit:
Okay i have found the problem.
It has to do with the option: Remove empty HTML tags?
Fixed in 3.2.4
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