In reply to Paul F Gilzow.

That's actually handy Paul, I wasn't aware that the builds were available that way. I also noticed that the support forums are still active for all 4 plugins:

https://wordpress.org/support/plugin/si-captcha-for-wordpress/
https://wordpress.org/support/plugin/si-contact-form/
https://wordpress.org/support/plugin/fast-secure-recaptcha/
https://wordpress.org/support/plugin/visitor-maps/

Actually, it looks like everyone in those forums is looking for the previous builds to roll back to, they could benefit from the links you mentioned.